Add and document fix task

Author: uuf6429

CONTRIBUTING.md

@@ -27,6 +27,14 @@ We use automated tools to ensure that the code has a consistent style and is of
 composer lint
 ```
 
+## Automated Fixes
+
+Some problems detected by the linting tools can be fixed automatically. Simply run the following:
+
+```shell
+composer fix
+```
+
 ## Contributing to Gherkin Translations
 
 Gherkin supports →40 different languages and you could add more! You might notice `i18n.php` file in the root of

composer.json

@@ -74,6 +74,15 @@
         "test": [
             "Composer\\Config::disableProcessTimeout",
             "vendor/bin/phpunit ./tests"
+        ],
+        "fix": [
+            "Composer\\Config::disableProcessTimeout",
+            "vendor/bin/php-cs-fixer fix --diff --show-progress=dots"
         ]
+    },
+    "config": {
+        "allow-plugins": {
+            "phpstan/extension-installer": false
+        }
     }
 }