Add support for carbon 2

Author: Justin Hayes

composer.json

@@ -15,7 +15,7 @@
         "guzzlehttp/guzzle": "^6.2",
         "illuminate/http": "^5.4",
         "illuminate/support": "^5.4",
-        "nesbot/carbon": "^1.22",
+        "nesbot/carbon": "^1.22 || ^2.0",
         "ramsey/uuid": "^3.6"
     },
     "require-dev": {