Merge pull request #35 from messagebird/header-accepts-bug

Bugfix: change Accepts header to Accept

Author: rfeiner

src/MessageBird/Common/HttpClient.php

@@ -130,7 +130,7 @@ public function performHttpRequest($method, $resourceName, $query = null, $body
 
         $headers = array (
             'User-agent: ' . implode(' ', $this->userAgent),
-            'Accepts: application/json',
+            'Accept: application/json',
             'Content-Type: application/json',
             'Accept-Charset: utf-8',
             sprintf('Authorization: AccessKey %s', $this->Authentication->accessKey)