Reaction.java:48-51: Add support to team discussion and...

The puzzle `1469-93fe85c7` from #1469 has to be resolved:

https://github.com/jcabi/jcabi-github/blob/2ce81e403cb31bb99dd87575a534e2b237532386/src/main/java/com/jcabi/github/Reaction.java#L48-L51

The puzzle was created by Paulo Lobo on 15-Jan-19.

If you have any technical questions, don't ask me, submit new tickets instead. The task will be \"done\" when the problem is fixed and the text of the puzzle is _removed_ from the source code. Here is more about [PDD](http://www.yegor256.com/2009/03/04/pdd.html) and [about me](http://www.yegor256.com/2017/04/05/pdd-in-action.html).