diff --git a/composer.json b/composer.json
index 5459fba..4d5b715 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
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         "illuminate/support": "^5.4",
-        "phpunit/phpunit": "~6.0"
+        "phpunit/phpunit": "~6.0|~7.0"
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     "require-dev": {
         "squizlabs/php_codesniffer": "^3.0",
diff --git a/composer.lock b/composer.lock
index 029972a..7f9bbd3 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,24 +4,24 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
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-    "content-hash": "b652cfc502bef4b791b8a78c85694041",
+    "content-hash": "8e839f86bc44b1a368b6e120cb4a681f",
     "packages": [
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             "name": "doctrine/inflector",
-            "version": "v1.2.0",
+            "version": "v1.3.0",
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                 "url": "https://github.com/doctrine/inflector.git",
-                "reference": "e11d84c6e018beedd929cff5220969a3c6d1d462"
+                "reference": "5527a48b7313d15261292c149e55e26eae771b0a"
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-                "reference": "e11d84c6e018beedd929cff5220969a3c6d1d462",
+                "url": "https://api.github.com/repos/doctrine/inflector/zipball/5527a48b7313d15261292c149e55e26eae771b0a",
+                "reference": "5527a48b7313d15261292c149e55e26eae771b0a",
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-                "php": "^7.0"
+                "php": "^7.1"
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@@ -29,7 +29,7 @@
             "type": "library",
             "extra": {
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-                    "dev-master": "1.2.x-dev"
+                    "dev-master": "1.3.x-dev"
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@@ -71,7 +71,7 @@
                 "singularize",
                 "string"
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-            "time": "2017-07-22T12:18:28+00:00"
+            "time": "2018-01-09T20:05:19+00:00"
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         {
             "name": "doctrine/instantiator",
@@ -181,6 +181,55 @@
             ],
             "time": "2014-09-09T13:34:57+00:00"
         },
+        {
+            "name": "dragonmantank/cron-expression",
+            "version": "v2.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/dragonmantank/cron-expression.git",
+                "reference": "8a84aee649c3a3ba03a721c1fb080e08dfbcd68b"
+            },
+            "dist": {
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+                "reference": "8a84aee649c3a3ba03a721c1fb080e08dfbcd68b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~5.7"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Cron\\": "src/Cron/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Chris Tankersley",
+                    "email": "chris@ctankersley.com",
+                    "homepage": "https://github.com/dragonmantank"
+                }
+            ],
+            "description": "CRON for PHP: Calculate the next or previous run date and determine if a CRON expression is due",
+            "keywords": [
+                "cron",
+                "schedule"
+            ],
+            "time": "2017-10-12T15:59:13+00:00"
+        },
         {
             "name": "egulias/email-validator",
             "version": "2.1.3",
@@ -466,41 +515,41 @@
         },
         {
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-            "version": "v5.5.28",
+            "version": "v5.6.3",
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                 "type": "git",
                 "url": "https://github.com/laravel/framework.git",
-                "reference": "cfafae1f2043208390a7c984e3070696f4969605"
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-                "reference": "cfafae1f2043208390a7c984e3070696f4969605",
+                "url": "https://api.github.com/repos/laravel/framework/zipball/db3e5422070d9b5166493313142b30419efab207",
+                "reference": "db3e5422070d9b5166493313142b30419efab207",
                 "shasum": ""
             },
             "require": {
                 "doctrine/inflector": "~1.1",
+                "dragonmantank/cron-expression": "~2.0",
                 "erusev/parsedown": "~1.6",
                 "ext-mbstring": "*",
                 "ext-openssl": "*",
                 "league/flysystem": "~1.0",
                 "monolog/monolog": "~1.12",
-                "mtdowling/cron-expression": "~1.0",
                 "nesbot/carbon": "~1.20",
-                "php": ">=7.0",
+                "php": "^7.1.3",
                 "psr/container": "~1.0",
                 "psr/simple-cache": "^1.0",
-                "ramsey/uuid": "~3.0",
+                "ramsey/uuid": "^3.7",
                 "swiftmailer/swiftmailer": "~6.0",
-                "symfony/console": "~3.3",
-                "symfony/debug": "~3.3",
-                "symfony/finder": "~3.3",
-                "symfony/http-foundation": "~3.3",
-                "symfony/http-kernel": "~3.3",
-                "symfony/process": "~3.3",
-                "symfony/routing": "~3.3",
-                "symfony/var-dumper": "~3.3",
-                "tijsverkoyen/css-to-inline-styles": "~2.2",
+                "symfony/console": "~4.0",
+                "symfony/debug": "~4.0",
+                "symfony/finder": "~4.0",
+                "symfony/http-foundation": "~4.0",
+                "symfony/http-kernel": "~4.0",
+                "symfony/process": "~4.0",
+                "symfony/routing": "~4.0",
+                "symfony/var-dumper": "~4.0",
+                "tijsverkoyen/css-to-inline-styles": "^2.2.1",
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@@ -536,19 +585,20 @@
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-                "doctrine/dbal": "~2.5",
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                 "mockery/mockery": "~1.0",
-                "orchestra/testbench-core": "3.5.*",
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+                "orchestra/testbench-core": "3.6.*",
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-                "phpunit/phpunit": "~6.0",
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-                "symfony/css-selector": "~3.3",
-                "symfony/dom-crawler": "~3.3"
+                "symfony/css-selector": "~4.0",
+                "symfony/dom-crawler": "~4.0"
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                 "aws/aws-sdk-php": "Required to use the SQS queue driver and SES mail driver (~3.0).",
-                "doctrine/dbal": "Required to rename columns and drop SQLite columns (~2.5).",
+                "doctrine/dbal": "Required to rename columns and drop SQLite columns (~2.6).",
                 "ext-pcntl": "Required to use all features of the queue worker.",
                 "ext-posix": "Required to use all features of the queue worker.",
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@@ -561,14 +611,14 @@
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                 "predis/predis": "Required to use the redis cache and queue drivers (~1.0).",
                 "pusher/pusher-php-server": "Required to use the Pusher broadcast driver (~3.0).",
-                "symfony/css-selector": "Required to use some of the crawler integration testing tools (~3.3).",
-                "symfony/dom-crawler": "Required to use most of the crawler integration testing tools (~3.3).",
+                "symfony/css-selector": "Required to use some of the crawler integration testing tools (~4.0).",
+                "symfony/dom-crawler": "Required to use most of the crawler integration testing tools (~4.0).",
                 "symfony/psr-http-message-bridge": "Required to psr7 bridging features (~1.0)."
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-                    "dev-master": "5.5-dev"
+                    "dev-master": "5.6-dev"
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@@ -596,20 +646,20 @@
                 "framework",
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-            "time": "2017-12-26T16:24:40+00:00"
+            "time": "2018-02-09T13:33:22+00:00"
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         {
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+            "version": "1.0.42",
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                 "url": "https://github.com/thephpleague/flysystem.git",
-                "reference": "f400aa98912c561ba625ea4065031b7a41e5a155"
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@@ -620,12 +670,13 @@
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-                "mockery/mockery": "~0.9",
-                "phpspec/phpspec": "^2.2",
-                "phpunit/phpunit": "~4.8"
+                "phpspec/phpspec": "^3.4",
+                "phpunit/phpunit": "^5.7"
             },
             "suggest": {
                 "ext-fileinfo": "Required for MimeType",
+                "ext-ftp": "Allows you to use FTP server storage",
+                "ext-openssl": "Allows you to use FTPS server storage",
                 "league/flysystem-aws-s3-v2": "Allows you to use S3 storage with AWS SDK v2",
                 "league/flysystem-aws-s3-v3": "Allows you to use S3 storage with AWS SDK v3",
                 "league/flysystem-azure": "Allows you to use Windows Azure Blob storage",
@@ -679,7 +730,7 @@
                 "sftp",
                 "storage"
             ],
-            "time": "2017-08-06T17:41:04+00:00"
+            "time": "2018-01-27T16:03:56+00:00"
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@@ -759,50 +810,6 @@
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-            "license": [
-                "MIT"
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-            "authors": [
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-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
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-            "description": "CRON for PHP: Calculate the next or previous run date and determine if a CRON expression is due",
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-                "schedule"
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-            "time": "2017-01-23T04:29:33+00:00"
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@@ -1107,16 +1114,16 @@
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "4.2.0",
+            "version": "4.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
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@@ -1154,7 +1161,7 @@
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             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2017-11-27T17:38:31+00:00"
+            "time": "2017-11-30T07:14:17+00:00"
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         {
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@@ -1205,16 +1212,16 @@
         },
         {
             "name": "phpspec/prophecy",
-            "version": "1.7.3",
+            "version": "1.7.4",
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                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "e4ed002c67da8eceb0eb8ddb8b3847bb53c5c2bf"
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@@ -1226,7 +1233,7 @@
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-                "phpunit/phpunit": "^4.8.35 || ^5.7"
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
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             "extra": {
@@ -1264,44 +1271,44 @@
                 "spy",
                 "stub"
             ],
-            "time": "2017-11-24T13:59:53+00:00"
+            "time": "2018-02-11T18:49:29+00:00"
         },
         {
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-            "version": "5.3.0",
+            "version": "6.0.1",
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                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "661f34d0bd3f1a7225ef491a70a020ad23a057a1"
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-                "php": "^7.0",
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                 "phpunit/php-text-template": "^1.2.1",
-                "phpunit/php-token-stream": "^2.0.1",
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             },
             "require-dev": {
-                "phpunit/phpunit": "^6.0"
+                "phpunit/phpunit": "^7.0"
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+                "ext-xdebug": "^2.6.0"
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@@ -1327,7 +1334,7 @@
                 "testing",
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-            "time": "2017-12-06T09:29:45+00:00"
+            "time": "2018-02-02T07:01:41+00:00"
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@@ -1419,28 +1426,28 @@
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+                "php": "^7.1"
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+                "phpunit/phpunit": "^7.0"
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+                    "dev-master": "2.0-dev"
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@@ -1455,7 +1462,7 @@
             "authors": [
                 {
                     "name": "Sebastian Bergmann",
-                    "email": "sb@sebastian-bergmann.de",
+                    "email": "sebastian@phpunit.de",
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@@ -1464,33 +1471,33 @@
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-            "time": "2017-02-26T11:10:40+00:00"
+            "time": "2018-02-01T13:07:23+00:00"
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             "name": "phpunit/php-token-stream",
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+            "version": "3.0.0",
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-                "php": "^7.0"
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@@ -1513,20 +1520,20 @@
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-            "time": "2017-11-27T05:48:46+00:00"
+            "time": "2018-02-01T13:16:43+00:00"
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         {
             "name": "phpunit/phpunit",
-            "version": "6.5.5",
+            "version": "7.0.1",
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@@ -4088,16 +4076,16 @@
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