RtUser.java:52-52: Implement operations...

The puzzle `913-32975020` in [`src/main/java/com/jcabi/github/RtUser.java`](https://github.com/jcabi/jcabi-github/blob/master/src/main/java/com/jcabi/github/RtUser.java) (lines 52-52) has to be resolved: "Implement operations RtUser.markAsRead()."

The puzzle was created by Dmitri Pisarenko on 22-Jan-15.

Estimate: 30 minutes, role: IMP.

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).