wsparcie dla watchFlags

```js
var FLAG_WATCH_NONE = 0;
var FLAG_WATCH_NEW_POSTS = 1;
var FLAG_WATCH_NEW_POST_LIKES = 2;
var FLAG_WATCH_NEW_COMMENTS = 4;
var FLAG_WATCH_NEW_COMMENT_LIKES = 8;

(...)

  groups: [
    {
      name: 'JS News',
      id: '217169631654737',
      watchFlags: FLAG_WATCH_NEW_POSTS | FLAG_WATCH_NEW_POST_LIKES
    }
]
```