Merge pull request #12 from thePanz/update-php-cs-support

Add php-cs-fixer dev requirement

Author: pspanja

.gitignore

@@ -1,2 +1,3 @@
 composer.lock
+.php_cs.cache
 /vendor/

.php_cs renamed to .php_cs.dist

@@ -26,7 +26,8 @@
         "php": "^5.6||^7.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7||^6.0 ||^7.0"
+        "phpunit/phpunit": "^5.7||^6.0 ||^7.0",
+        "friendsofphp/php-cs-fixer": "^2.11"
     },
     "autoload": {
         "psr-4": {