creating a release on github

[Spaenny]

I think it would be benefical to create a release after a travis build, currently nightly builds for docker container who use checksums fail because it getting updated. (See here https://github.com/melkortf/tf2-servers/pull/7)

This would be solved if there is a release tag. I have no clue of Travis, but adding:

See #55

in the after_success group should do the trick correct?

[garrappachc]

+1 to that. Versioning the builds in any way and making them part of GitHub releases is the preferred way.

[sapphonie]

+1, please do this