readthedocs doesn't build on tag

[DifferentialOrange]

Documentation is built on each push to master but doesn't built on tag push.

[DifferentialOrange]

What should happen:

• master docs branch is rebuilt to display new tag,
• stable docs branch is rebuilt to display new tag,
• latest docs branch is rebuilt to display new tag,
• (optional) new tagged version is "active" (see "Version" tab settings).

[DifferentialOrange]

Actually, it seems like it builds on tag, but doesn't rebuild a master/latest brach