remove unused require statement
diff --git a/lib/utils.js b/lib/utils.js
index 9517475..d84ccc3 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -1,7 +1,6 @@
 var _ = require('lodash');
 var request = require('request');
 var Agent = require('agentkeepalive');
-var when = require('when');
 
 module.exports = function(
   tid,