v0.15.1

This version has minor fixes to the styling of deprecation notices, and fixes 3 known issues:

1. #187 (lists of tables and figures should have their hyperlinks rendered in black font)
2. #186 (avoid breaking URL hyperlinks on : or .)
3. #182 (filenames in PR workflows referenced merge commits instead of head commit of source branch)

What's Changed

• Check out head_ref of source branch on PRs by @chrisfenner in #188

Full Changelog: v0.15.0...v0.15.1