Add illuminate/support as a dev dependecy

Author: ivanvermeyen

composer.json

@@ -21,6 +21,7 @@
         "php": "^7.0"
     },
     "require-dev": {
+        "illuminate/support": "^5.5|^6.0|^7.0|^8.0",
         "mockery/mockery": "^1.0",
         "phpunit/phpunit": "^6.0|^7.0|^8.0|^9.0"
     },