routing-controllers: @Authorized in version 0.7.2 stilll return 404.

happen:

   use Koa2 **async** controller with **async** authorizationChecker, still return a 404 in **@Authorized( )** decorator.

version:

   typescript: 2.4.2
   node: 7.6.0
   koa: 2.3.0
   routing-controllers: 0.7.2
   reflect0metadata: 0.1.10

code:

function sleep( time ) {
          return new Promise(( ok ,noOK ) => {
                  setTimeout(( ) => {
                        console.log('ok')
                        ok( );
                   }, time );
            })
}

@JsonController('/users')
export class UserCtrl {

  @Get('/')
  @Authorized( )
  async getAll(  ) {
        await sleep( 1000 );
        return "hahah" // serve return a 404 instead of ‘hahah’
  }
}

const app = new Koa( );
useKoaServer( app, {
  defaults: {
    paramOptions: {
      required: true
    }
  },
  authorizationChecker,
  routePrefix: '/api',
  controllers: [ UserCtrl ]
});
app.listen( 4000 );

async function authorizationChecker( action: Action, roles: string[]) {
  console.log('i am authorizationChecker')
  await sleep( 1000 );
  return true;
}