fix build - lodash assign

Author: pofider

lib/client.js

@@ -8,7 +8,7 @@
 var request = require('request')
 var url = require('url')
 var concat = require('concat-stream')
-var assign = require('object-assign')
+var assign = require('lodash.assign')
 
 module.exports = function (url, username, password) {
   return new Client(url, username, password)