Releasing

Change the version in gradle.properties to a non-SNAPSHOT version.
Update the CHANGELOG.md.
Update the README.md with the new version.
git commit -am "Prepare for release x.y.z"
git push (travis will build and upload artifacts)
git tag -a x.y.z -m "Version x.y.z"
Update the gradle.properties to the next SNAPSHOT version.
git commit -am "Prepare next development version."
git push && git push --tags