chore: add support for laravel 7 and 8

Author: willtj

composer.json

@@ -55,7 +55,7 @@
     },
     "require": {
         "php": ">=7.1.0",
-        "laravel/framework": "5.5.*|5.6.*|5.7.*|5.8.*|^6.0"
+        "laravel/framework": "5.5.*|5.6.*|5.7.*|5.8.*|^6.0|^7.0|^8.0"
     },
     "require-dev": {
         "codeclimate/php-test-reporter": "dev-master",