Each version of the taxonomy should be tagged in git and available as a Release in GitHub

[monfresh]

Whenever you release a new version, please tag it in git. For example:

git tag -a v1.0.0 -m "Release 1.0.0"
git push --tags

This will automatically create a new Release on GitHub, which you can then add Release Notes to. GitHub provides a nice editor for releases. Here is an example: https://github.com/octokit/octokit.rb/releases

Each release that is not backwards-compatible MUST contain an upgrade guide. Here's a good example:

https://github.com/octokit/octokit.rb#upgrading-guide

[haileypate]

+1 for sure!!