update log version

Author: justinlguo

CHANGELOG.md

@@ -1,5 +1,8 @@
 cos-php-sdk-v5 Upgrade Guide
 ====================
+2.6.13 to 2.6.14
+---------
+修复部分问题
 2.6.12 to 2.6.13
 ---------
 修复部分问题

src/Client.php

@@ -280,7 +280,7 @@
  * @see \Qcloud\Cos\Service::getService()
  */
 class Client extends GuzzleClient {
-    const VERSION = '2.6.13';
+    const VERSION = '2.6.14';
 
     public $httpClient;