Callback does not work
Hello!

A lot of time has been spent, but I do not understand what the matter is.

redirect link 
"callback?code=4/here_is_the_token#"

app.js
```
import passport from 'koa-passport'
const app = new Koa()
app.keys = ['secret']
app.use(session(app))
app.use(bodyParser())
import './helpers/auth'
app.use(passport.initialize())
app.use(passport.session())
app.use(routes)
```
auth.js
```
import passport from 'koa-passport'
import googleStrategy from 'passport-google-oauth20'
import { users } from '../models/index'
import config from 'config'
const googleMain = new googleStrategy({
    clientID: config.get('oauth.clientID'),
    clientSecret: config.get('oauth.clientSecret'),
    callbackURL: config.get('oauth.callbackURL')
}, (accessToken, refreshToken, profile, done) => {
    //is not called
    console.log(profile)
    return done(null, profile)
})
passport.use(googleMain)
```
auth.routes.js
```
import Router from 'koa-router'
import auth from '../actions/auth.actions'
import passport from 'koa-passport'
const router = new Router({prefix:'/auth'})
router.get('/google', passport.authenticate('google', { 
	scope: ['profile'] 
}))
router.get('/google/callback', (ctx, next)=>{
	console.log('redirect')
})
export default router.routes()
```
Tell me, what's the problem? Why the callback is not called

