Support to phpunit ^7.0

Author: silasrm

composer.json

@@ -30,7 +30,7 @@
     },
     "require-dev": {
         "mockery/mockery": "^1.3",
-        "phpunit/phpunit": "^8.0|^9.0"
+        "phpunit/phpunit": "^7.0|^8.0|^9.0"
     },
     "autoload": {
         "psr-4": {