Upgrade tightenco/collect to ^7.0.

Author: rugaard

composer.json

@@ -32,7 +32,7 @@
     "php": "^7.2",
     "ext-json": "*",
     "guzzlehttp/guzzle": "^6.0",
-    "tightenco/collect": "^5.8"
+    "tightenco/collect": "^7.0"
   },
   "require-dev": {
     "mockery/mockery": "^1.0",