diff --git a/examples/testing/Pipfile.lock b/examples/testing/Pipfile.lock
index 9309a96..be0d70e 100644
--- a/examples/testing/Pipfile.lock
+++ b/examples/testing/Pipfile.lock
@@ -18,24 +18,24 @@
     "default": {
         "atomicwrites": {
             "hashes": [
-                "sha256:03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4",
-                "sha256:75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"
+                "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197",
+                "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"
             ],
-            "version": "==1.3.0"
+            "version": "==1.4.0"
         },
         "attrs": {
             "hashes": [
-                "sha256:10cbf6e27dbce8c30807caf056c8eb50917e0eaafe86347671b57254006c3e69",
-                "sha256:ca4be454458f9dec299268d472aaa5a11f67a4ff70093396e1ceae9c76cf4bbb"
+                "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6",
+                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
             ],
-            "version": "==18.2.0"
+            "version": "==20.3.0"
         },
         "canonicaljson": {
             "hashes": [
-                "sha256:45bce530ff5fd0ca93703f71bfb66de740a894a3b5dd6122398c6d8f18539725",
-                "sha256:e7fe5b1d5a2b740c188ec2860fad0578aabff2cc59edcb41c02eb4d472b95ded"
+                "sha256:899b7604f5a6a8a92109115d9250142cdf0b1dfdcb62cdb21d8fb5bf37780631",
+                "sha256:b1582cb736a020e5ca4e700185db89037fbcd91d54623c0c5d830724df6803ae"
             ],
-            "version": "==1.1.4"
+            "version": "==1.4.0"
         },
         "cnab": {
             "hashes": [
@@ -51,6 +51,14 @@
             ],
             "version": "==1.2"
         },
+        "importlib-metadata": {
+            "hashes": [
+                "sha256:19192b88d959336bfa6bdaaaef99aeafec179eca19c47c804e555703ee5f07ef",
+                "sha256:2e881981c9748d7282b374b68e759c87745c25427b67ecf0cc67fb6637a1bff9"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==4.0.0"
+        },
         "jsonschema": {
             "hashes": [
                 "sha256:000e68abd33c972a5248544925a0cae7d1125f9bf6c58280d37546b946769a08",
@@ -61,25 +69,25 @@
         },
         "more-itertools": {
             "hashes": [
-                "sha256:38a936c0a6d98a38bcc2d03fdaaedaba9f412879461dd2ceff8d37564d6522e4",
-                "sha256:c0a5785b1109a6bd7fac76d6837fd1feca158e54e521ccd2ae8bfe393cc9d4fc",
-                "sha256:fe7a7cae1ccb57d33952113ff4fa1bc5f879963600ed74918f1236e212ee50b9"
+                "sha256:5652a9ac72209ed7df8d9c15daf4e1aa0e3d2ccd3c87f8265a0673cd9cbc9ced",
+                "sha256:c5d6da9ca3ff65220c3bfd2a8db06d698f05d4d2b9be57e1deb2be5a45019713"
             ],
-            "version": "==5.0.0"
+            "version": "==8.7.0"
         },
         "pluggy": {
             "hashes": [
-                "sha256:8ddc32f03971bfdf900a81961a48ccf2fb677cf7715108f85295c67405798616",
-                "sha256:980710797ff6a041e9a73a5787804f848996ecaa6f8a1b1e08224a5894f2074a"
+                "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0",
+                "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"
             ],
-            "version": "==0.8.1"
+            "version": "==0.13.1"
         },
         "py": {
             "hashes": [
-                "sha256:bf92637198836372b520efcba9e020c330123be8ce527e535d185ed4b6f45694",
-                "sha256:e76826342cefe3c3d5f7e8ee4316b80d1dd8a300781612ddbc765c17ba25a6c6"
+                "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3",
+                "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"
             ],
-            "version": "==1.7.0"
+            "index": "pypi",
+            "version": "==1.10.0"
         },
         "pytest": {
             "hashes": [
@@ -91,27 +99,76 @@
         },
         "simplejson": {
             "hashes": [
-                "sha256:067a7177ddfa32e1483ba5169ebea1bc2ea27f224853211ca669325648ca5642",
-                "sha256:2fc546e6af49fb45b93bbe878dea4c48edc34083729c0abd09981fe55bdf7f91",
-                "sha256:354fa32b02885e6dae925f1b5bbf842c333c1e11ea5453ddd67309dc31fdb40a",
-                "sha256:37e685986cf6f8144607f90340cff72d36acf654f3653a6c47b84c5c38d00df7",
-                "sha256:3af610ee72efbe644e19d5eaad575c73fb83026192114e5f6719f4901097fce2",
-                "sha256:3b919fc9cf508f13b929a9b274c40786036b31ad28657819b3b9ba44ba651f50",
-                "sha256:3dd289368bbd064974d9a5961101f080e939cbe051e6689a193c99fb6e9ac89b",
-                "sha256:6c3258ffff58712818a233b9737fe4be943d306c40cf63d14ddc82ba563f483a",
-                "sha256:75e3f0b12c28945c08f54350d91e624f8dd580ab74fd4f1bbea54bc6b0165610",
-                "sha256:b1f329139ba647a9548aa05fb95d046b4a677643070dc2afc05fa2e975d09ca5",
-                "sha256:ee9625fc8ee164902dfbb0ff932b26df112da9f871c32f0f9c1bcf20c350fe2a",
-                "sha256:fb2530b53c28f0d4d84990e945c2ebb470edb469d63e389bf02ff409012fe7c5"
+                "sha256:034550078a11664d77bc1a8364c90bb7eef0e44c2dbb1fd0a4d92e3997088667",
+                "sha256:05b43d568300c1cd43f95ff4bfcff984bc658aa001be91efb3bb21df9d6288d3",
+                "sha256:0dd9d9c738cb008bfc0862c9b8fa6743495c03a0ed543884bf92fb7d30f8d043",
+                "sha256:10fc250c3edea4abc15d930d77274ddb8df4803453dde7ad50c2f5565a18a4bb",
+                "sha256:2862beabfb9097a745a961426fe7daf66e1714151da8bb9a0c430dde3d59c7c0",
+                "sha256:292c2e3f53be314cc59853bd20a35bf1f965f3bc121e007ab6fd526ed412a85d",
+                "sha256:2d3eab2c3fe52007d703a26f71cf649a8c771fcdd949a3ae73041ba6797cfcf8",
+                "sha256:2e7b57c2c146f8e4dadf84977a83f7ee50da17c8861fd7faf694d55e3274784f",
+                "sha256:311f5dc2af07361725033b13cc3d0351de3da8bede3397d45650784c3f21fbcf",
+                "sha256:344e2d920a7f27b4023c087ab539877a1e39ce8e3e90b867e0bfa97829824748",
+                "sha256:3fabde09af43e0cbdee407555383063f8b45bfb52c361bc5da83fcffdb4fd278",
+                "sha256:42b8b8dd0799f78e067e2aaae97e60d58a8f63582939af60abce4c48631a0aa4",
+                "sha256:4b3442249d5e3893b90cb9f72c7d6ce4d2ea144d2c0d9f75b9ae1e5460f3121a",
+                "sha256:55d65f9cc1b733d85ef95ab11f559cce55c7649a2160da2ac7a078534da676c8",
+                "sha256:5c659a0efc80aaaba57fcd878855c8534ecb655a28ac8508885c50648e6e659d",
+                "sha256:72d8a3ffca19a901002d6b068cf746be85747571c6a7ba12cbcf427bfb4ed971",
+                "sha256:75ecc79f26d99222a084fbdd1ce5aad3ac3a8bd535cd9059528452da38b68841",
+                "sha256:76ac9605bf2f6d9b56abf6f9da9047a8782574ad3531c82eae774947ae99cc3f",
+                "sha256:7d276f69bfc8c7ba6c717ba8deaf28f9d3c8450ff0aa8713f5a3280e232be16b",
+                "sha256:7f10f8ba9c1b1430addc7dd385fc322e221559d3ae49b812aebf57470ce8de45",
+                "sha256:8042040af86a494a23c189b5aa0ea9433769cc029707833f261a79c98e3375f9",
+                "sha256:813846738277729d7db71b82176204abc7fdae2f566e2d9fcf874f9b6472e3e6",
+                "sha256:845a14f6deb124a3bcb98a62def067a67462a000e0508f256f9c18eff5847efc",
+                "sha256:869a183c8e44bc03be1b2bbcc9ec4338e37fa8557fc506bf6115887c1d3bb956",
+                "sha256:8acf76443cfb5c949b6e781c154278c059b09ac717d2757a830c869ba000cf8d",
+                "sha256:8f713ea65958ef40049b6c45c40c206ab363db9591ff5a49d89b448933fa5746",
+                "sha256:934115642c8ba9659b402c8bdbdedb48651fb94b576e3b3efd1ccb079609b04a",
+                "sha256:9551f23e09300a9a528f7af20e35c9f79686d46d646152a0c8fc41d2d074d9b0",
+                "sha256:9a2b7543559f8a1c9ed72724b549d8cc3515da7daf3e79813a15bdc4a769de25",
+                "sha256:a55c76254d7cf8d4494bc508e7abb993a82a192d0db4552421e5139235604625",
+                "sha256:ad8f41c2357b73bc9e8606d2fa226233bf4d55d85a8982ecdfd55823a6959995",
+                "sha256:af4868da7dd53296cd7630687161d53a7ebe2e63814234631445697bd7c29f46",
+                "sha256:afebfc3dd3520d37056f641969ce320b071bc7a0800639c71877b90d053e087f",
+                "sha256:b59aa298137ca74a744c1e6e22cfc0bf9dca3a2f41f51bc92eb05695155d905a",
+                "sha256:bc00d1210567a4cdd215ac6e17dc00cb9893ee521cee701adfd0fa43f7c73139",
+                "sha256:c1cb29b1fced01f97e6d5631c3edc2dadb424d1f4421dad079cb13fc97acb42f",
+                "sha256:c94dc64b1a389a416fc4218cd4799aa3756f25940cae33530a4f7f2f54f166da",
+                "sha256:ceaa28a5bce8a46a130cd223e895080e258a88d51bf6e8de2fc54a6ef7e38c34",
+                "sha256:cff6453e25204d3369c47b97dd34783ca820611bd334779d22192da23784194b",
+                "sha256:d0b64409df09edb4c365d95004775c988259efe9be39697d7315c42b7a5e7e94",
+                "sha256:d4813b30cb62d3b63ccc60dd12f2121780c7a3068db692daeb90f989877aaf04",
+                "sha256:da3c55cdc66cfc3fffb607db49a42448785ea2732f055ac1549b69dcb392663b",
+                "sha256:e058c7656c44fb494a11443191e381355388443d543f6fc1a245d5d238544396",
+                "sha256:fed0f22bf1313ff79c7fc318f7199d6c2f96d4de3234b2f12a1eab350e597c06",
+                "sha256:ffd4e4877a78c84d693e491b223385e0271278f5f4e1476a4962dca6824ecfeb"
             ],
-            "version": "==3.16.0"
+            "version": "==3.17.2"
         },
         "six": {
             "hashes": [
-                "sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c",
-                "sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"
+                "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
+                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
+            ],
+            "version": "==1.15.0"
+        },
+        "typing-extensions": {
+            "hashes": [
+                "sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918",
+                "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c",
+                "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==3.7.4.3"
+        },
+        "zipp": {
+            "hashes": [
+                "sha256:3607921face881ba3e026887d8150cca609d517579abe052ac81fc5aeffdbd76",
+                "sha256:51cb66cc54621609dd593d1787f286ee42a5c0adbb4b29abea5a63edc3e03098"
             ],
-            "version": "==1.12.0"
+            "version": "==3.4.1"
         }
     },
     "develop": {}