Create git tags every time a new Refined GitHub version is released #1976

This will:

• create a versioned tag on cronjob and tags called hotfix
• publish all other tags using the tag name as version

WARNING: As of a5aaa54 it already works from this branch, so any changes will be published to git releases and the old travis job will pick that up and publish it to the stores. This instant publishing is temporary and for testing only.

@sindresorhus I'd like to avoid giving my GH API token to travis, so I'd rather set this up with SSH, if possible: 6345bcf

Perhaps this can be done in https://github.com/sindresorhus/refined-github/settings/keys

Reference:

• https://github.com/alrra/travis-scripts/blob/master/docs/github-deploy-keys.md
• https://help.github.com/en/articles/which-remote-url-should-i-use#cloning-with-ssh-urls