RtLogsITCase.java:41-45: Fix the IT case for follow(), it...

The puzzle `256-2502f853` from #256 has to be resolved:

https://github.com/amihaiemil/docker-java-api/blob/ef61751b7d34d3dc9611570be71eab03d1e10a61/src/test/java/com/amihaiemil/docker/RtLogsITCase.java#L41-L45

The puzzle was created by amihaiemil on 03-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).