plugin doesn't work with mochawait

[vaukalak]

code:

import { it, before, after, beforeEach, afterEach } from 'arrow-mocha/es5';
import mochawait from 'mochawait';

describe('RoomService', () => {
   describe('joinOrCreateRoom', () => {

       before((context) => {
          context.test = [];
       });

       it('should create new room with one player', (context) : void => {
           context.test.length;
       });
   });
});

will fail with:

TypeError: Cannot set property 'test' of undefined

This happens, cause mochawait hooks mocha lifecycle as well. But it'd be really cool to use those extensions together.