Fix URL is undefined

See #96

Author: suufi

lib/util/getVerification.js

@@ -3,6 +3,7 @@ var http = require('./http.js').func
 var getHash = require('./getHash.js').func
 var getVerificationInputs = require('./getVerificationInputs.js').func
 var cache = require('../cache')
+var URL = require('url').URL
 
 // Args
 exports.required = ['url']