Added php_cs config

Author: haphan

.php_cs.dist

@@ -0,0 +1,19 @@
+<?php
+if (!file_exists(__DIR__.'/src')) {
+    exit(0);
+}
+return PhpCsFixer\Config::create()
+    ->setRules(
+        [
+            '@PSR2'                => true,
+            'array_syntax'         => ['syntax' => 'short'],
+            'protected_to_private' => false
+        ]
+    )
+    ->setUsingCache(false)
+    ->setRiskyAllowed(true)
+    ->setFinder(
+        PhpCsFixer\Finder::create()
+            ->in(__DIR__.'/src')
+            ->append([__FILE__])
+    );

.travis.yml

@@ -24,7 +24,7 @@ before_install:
 before_script:
   - composer install --prefer-source
   - vendor/bin/parallel-lint --exclude vendor .
-  - vendor/bin/php-cs-fixer fix --dry-run --diff --rules=@PSR2 .
+  - vendor/bin/php-cs-fixer fix --dry-run --diff .
   - phpenv config-add ./xdebug.ini
 
 after_script: