removed dependency on fphammerle\helpers in production

Authenticator.php

@@ -4,8 +4,6 @@ namespace fphammerle\yii2\auth\clientcert;
 
 class Authenticator extends \yii\base\Component
 {
-    use \fphammerle\helpers\PropertyAccessTrait;
-
     public function init()
     {
         parent::init();

composer.json

@@ -9,11 +9,11 @@
     ],
     "require": {
         "php": ">=5.4.0",
-        "yiisoft/yii2": "^2.0",
-        "fphammerle/helpers": "^1.2"
+        "yiisoft/yii2": "^2.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8"
+        "phpunit/phpunit": "^4.8",
+        "fphammerle/helpers": "^1.2"
     },
     "autoload": {
         "psr-4": {