feat: support Laravel 6-9

Author: koshuang

composer.json

@@ -18,9 +18,9 @@
     },
     "require-dev": {
         "fzaninotto/faker": "^1.9@dev",
-        "illuminate/contracts": "^7.0",
-        "illuminate/log": "^7.0",
-        "illuminate/support": "^7.0",
+        "illuminate/contracts": "^6.0|^7.0|^8.0|^9.0",
+        "illuminate/log": "^6.0|^7.0|^8.0|^9.0",
+        "illuminate/support": "^6.0|^7.0|^8.0|^9.0",
         "mockery/mockery": "^1.3.2",
         "nunomaduro/larastan": "^1.0",
         "orchestra/database": "^5.0",