remove useless comma in index.js

Author: longbai

index.js

@@ -8,5 +8,5 @@ module.exports = {
   fop: require(libpath + '/fop.js'),
   conf: require(libpath + '/conf.js'),
   rpc: require(libpath + '/rpc.js'),
-  util: require(libpath + '/util.js'),
+  util: require(libpath + '/util.js')
 };