First, update the version number in bower.json, package.json, VERSION.txt and add the date to changes.md (remove the -dev from the version number in VERSION.txt)
git checkout --track origin/release
git merge --no-commit --no-ff master
make check
git commit -am "Merge master into release branch"
make bundle
git add -f bundle.js
git commit bundle.js -m "Add bundle for next release 2.0.0"
git tag 2.0.0
git push && git push --tags