chore(package): upgrade leancloud-storage to v1.5

Author: leeyeh

package.json

@@ -13,7 +13,7 @@
     "cookies": "0.5.0",
     "debug": "2.0.0",
     "iconv-lite": "^0.4.8",
-    "leancloud-storage": "~1.4.0",
+    "leancloud-storage": "~1.5.1",
     "on-headers": "1.0.0",
     "underscore": "^1.8.3"
   },