Remove warning about the last seen bug fixed in 0.4

Now that 0.4.1.0 is out, we can remove this warning, most of the pods upgraded already.

You can want to add the 0.4.0.0 milestone to the issue https://github.com/diaspora/diaspora/issues/4734 in the diaspora repository.
Merge pull request #25 from Flaburgan/patch-1

Remove warning about the last seen bug fixed in 0.4