Update dependencies

Author: colinhall17

composer.json

@@ -16,13 +16,12 @@
     ],
     "require": {
         "php": "^7.0",
-        "nesbot/carbon": "^1.3",
+        "nesbot/carbon": "^1.3|^2.0",
         "illuminate/support": "^5.5|^6.0|^7.0",
         "league/oauth2-client": "^2.0"
     },
     "require-dev": {
-        "mockery/mockery": "^1.3.1",
-        "phpunit/phpunit": "^8.5"
+        "phpunit/phpunit": "^8.0"
     }, 
     "autoload": {
         "psr-4": {