fix: make sure signed=false on set/get cookie (#24)

test/index.test.js

@@ -1,17 +1,5 @@
-/**
- * Copyright(c) koajs and other contributors.
- * MIT Licensed
- *
- * Authors:
- *   fengmk2 <m@fengmk2.com> (http://fengmk2.com)
- */
-
 'use strict';
 
-/**
- * Module dependencies.
- */
-
 const assert = require('assert');
 const koa = require('koa');
 const request = require('supertest');
@@ -482,4 +470,3 @@ function createApp(options) {
 
   return app;
 }
-