Added Laravel 9 Support (#74)

* Update composer.json for laravel 9 support

* bump orchestra/testbench to 7.0 for laravel 9 support

Author: jnbn

composer.json

@@ -54,12 +54,12 @@
     },
     "require": {
         "php": "^7.1.3|^8.0",
-        "illuminate/database": "^5.8|^6.0|^7.0|^8.0"
+        "illuminate/database": "^5.8|^6.0|^7.0|^8.0|^9.0"
     },
     "require-dev": {
         "mockery/mockery": "^1.0",
         "orchestra/database": "~3.8.0|^4.0|^5.0|^6.0",
-        "orchestra/testbench": "~3.8.0|^4.0|^5.0|^6.0",
+        "orchestra/testbench": "~3.8.0|^4.0|^5.0|^6.0|^7.0",
         "phpunit/phpunit": "^7.0|^8.0|^9.0"
     },
     "autoload": {