Temporary remove the dependency

Author: akalongman

composer.json

@@ -33,8 +33,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8|^5.7|^6.5|^7.4",
-        "squizlabs/php_codesniffer": "^3.3",
-        "phpstan/phpstan": "^0.10.5"
+        "squizlabs/php_codesniffer": "^3.3"
     },
     "autoload": {
         "psr-4": {