issue #13 - use short array notation thanks to PHP 5.4 minimal version

Author: mikaelcom

.php_cs

@@ -9,6 +9,9 @@ return PhpCsFixer\Config::create()
 	->setUsingCache(false)
     ->setRules(array(
         '@PSR2' => true,
+        'array_syntax' => [
+            'syntax' => 'short',
+        ],
         'binary_operator_spaces' => true,
         'no_whitespace_in_blank_line' => true,
         'ternary_operator_spaces' => true,