Converts a Koa app into a supertest compatible agent instance.
npm install supertest-koa-agent  
``shell`
npm install supertest-koa-agent --save-dev
###### npm stats
  
`js
var agent = require('supertest-koa-agent');
var Koa = require('koa')
var app = new Koa()
agent(app)
`
###### arguments
- app: (Application) Koa application instance.
###### returns
- (Object)` Supertest agent instance.
> SEE: contributing.md
