chore: use PSR-12 as our coding standard

Author: xel1045

CONTRIBUTING.md

@@ -7,7 +7,7 @@ We accept contributions via Pull Requests on [Github](https://github.com/eXolnet
 
 ## Pull Requests
 
-- **[PSR-2 Coding Standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md)** - Check the code style with ``$ composer lint`` and fix it with ``$ composer lint-fix``.
+- **[PSR-12 Coding Standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-12-extended-coding-style-guide.md)** - Check the code style with ``$ composer lint`` and fix it with ``$ composer lint-fix``.
 
 - **Add tests!** - Your patch won't be accepted if it doesn't have tests.
 

composer.json

@@ -37,8 +37,8 @@
         }
     },
     "scripts": {
-        "lint": "vendor/bin/phpcs -p --standard=PSR2 config src tests",
-        "lint-fix": "vendor/bin/phpcbf -p --standard=PSR2 config src tests",
+        "lint": "vendor/bin/phpcs -p --standard=PSR12 config src tests",
+        "lint-fix": "vendor/bin/phpcbf -p --standard=PSR12 config src tests",
         "test": "vendor/bin/phpunit",
         "test-coverage": "vendor/bin/phpunit --coverage-html coverage"
     },