Merge pull request #3 from WangZishi/patch-1

修复 hasOwnProperty 返回值是 undefined 的问题

Author: JacksonTian

lib/client.js

@@ -12,7 +12,7 @@ const Base = require('./base');
 
 const form = 'application/x-www-form-urlencoded';
 const hasOwnProperty = function (obj, key) {
-  Object.prototype.hasOwnProperty.call(obj, key);
+  return Object.prototype.hasOwnProperty.call(obj, key);
 };
 
 /**