Re-generate results available online if tests have changed:

rm -rf results log.html report.html output.xml
pybot --outputdir results QuickStart.rst
git checkout gh-pages
mv -f results/*.* .
rmdir results
git commit -a -m "Updated results available online"
git checkout master
git push

Create tag:

VERSION=x.y    # Set this!!
git tag -a -m "Release $VERSION" $VERSION
git push --tags

Create release at https://github.com/robotframework/QuickStartGuide/releases

Announce on Twitter, mailing lists, and elsewhere as needed.