Add release tags

[Tobias Preuss]

Please maintain consistent releases by also adding Git tags and pushing them to this repository.
Please consider using semantic versioning for release tags.

$ git checkout {some-release-commit}
$ git tag -a "v.1.0.0" -m "Short summary of the release."
$ git push -tags origin master

[Luke Klinker]

Done, thanks

[Tobias Preuss]

Nice. Thank you.