Remove direct Carbon dependency

Author: casperboone

composer.json

@@ -15,8 +15,7 @@
         "php": ">=7.2",
         "guzzlehttp/guzzle": "^6.2",
         "illuminate/notifications": "5.5.*|5.6.*|5.7.*|5.8.*",
-        "illuminate/support": "5.5.*|5.6.*|5.7.*|5.8.*",
-        "nesbot/carbon": "^1.21"
+        "illuminate/support": "5.5.*|5.6.*|5.7.*|5.8.*"
     },
     "require-dev": {
         "mockery/mockery": "^1.0",