use meitudata in Config

src/Qiniu/Config.php

@@ -10,7 +10,7 @@ final class Config
     const RSF_HOST = 'rs1.meitudata.com';
     const API_HOST = 'rs1.meitudata.com';
     const RS_HOST = 'rs1.meitudata.com';      //RS Host
-    const UC_HOST = 'https://rs1.qiniu.com';              //UC Host
+    const UC_HOST = 'https://rs1.meitudata.com';              //UC Host
 
     // Zone 空间对应的机房
     public $zone;