Merge pull request #240 from php-school/phpstan-fixes

Author: AydinHassan

composer.json

@@ -37,9 +37,8 @@
         "phpunit/phpunit": "^8.5",
         "composer/composer": "^2.0",
         "squizlabs/php_codesniffer": "^3.4",
-        "phpstan/phpstan": "^0.12.50",
+        "phpstan/phpstan": "^1.8",
         "phpstan/extension-installer": "^1.0",
-        "phpstan/phpstan-symfony": "^0.12.8",
         "yoast/phpunit-polyfills": "^0.2.0"
     },
     "autoload" : {
@@ -66,5 +65,10 @@
             "phpcbf test --standard=PSR12 --encoding=UTF-8"
         ],
         "static": "phpstan --ansi analyse --level max src"
+    },
+    "config": {
+        "allow-plugins": {
+            "phpstan/extension-installer": true
+        }
     }
 }