Update composer.json

Author: nicoSWD

composer.json

@@ -37,8 +37,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "^7.0|^8.0|^9.3",
-    "mockery/mockery": "^1.0|^1.4",
-    "phpstan/phpstan": "^0.12.3"
+    "mockery/mockery": "^1.0|^1.4"
   },
   "scripts": {
     "test": "vendor/bin/phpunit"