Issues fixed

Author: dercoder

composer.json

@@ -18,15 +18,16 @@
     }
   },
   "require": {
-    "php": "5.6 | 7.*",
+    "php": "^5.6|^7",
     "ext-simplexml": "*",
     "ext-dom": "*",
     "omnipay/common": "^3.0"
   },
   "require-dev": {
     "omnipay/tests": "^3.0",
     "satooshi/php-coveralls": "1.0.0",
-    "guzzlehttp/guzzle": "^6.5.5"
+    "guzzlehttp/guzzle": "^6.5.5",
+    "squizlabs/php_codesniffer": "3.*"
   },
   "suggest": {
     "guzzlehttp/guzzle": "To handle WebMoney payouts",