Set variables:
$ export VERSION=X.Y.Z
$ export GPG_KEY=EA456E8BAF0109429583EED83578F667F2F3A5FA
Update version numbers:
$ vim package.json
$ npm install
Commit & tag:
$ git commit -S${GPG_KEY} -m "Release v${VERSION}"
$ git tag -s -u ${GPG_KEY} v${VERSION} -m "Version ${VERSION}"
Publish:
$ git push && git push --tags