TRAVIS: Disable push of tag

Merge pull request GraphWalker#70 from KristianKarl/3.4.2

3.4.2

Merge pull request GraphWalker#68 from KristianKarl/3.4.1

Bug fixes for 3.4.1

Release 3.4.0

Prepare for release 3.3.0

Update README.md

Prepare for release 3.2.0

Release 3.1.1

Prepare for release

Release 3.0.0