Update version to 1.1.1.

Author: yaozongyou

src/Qcloud/Cos/Client.php

@@ -11,7 +11,7 @@
 use Qcloud\Cos\TokenListener;
 
 class Client extends GSClient {
-    const VERSION = '1.1.0';
+    const VERSION = '1.1.1';
 
     private $region;       // string: region.
     private $credentials;