fixed issue if not using mocks

.travis.yml

@@ -1,3 +1,4 @@
 language: node_js
 node_js:
 - 'node'
+- '4.2'

lib/local-web-server.js

@@ -61,6 +61,7 @@ function localWebServer (options) {
 
   options.rewrite = arrayify(options.rewrite)
   options.forbid = arrayify(options.forbid)
+  options.mocks = arrayify(options.mocks)
 
   const debug = require('debug')('local-web-server')
   const Koa = require('koa')