🐛 Fix the last version+date underline in changelog

[webknjaz]

The current changelog has invalid syntax with a missing title underline rendering ugly plain text merge of two titles ("version+date" title + "bugfix" title). This patch addresses the immediate problem but I haven't checked what caused it (whether it's automation that is broken or a simple human error).

I'm not adding a change note because it seems unnecessary in this case.

Contribution checklist:

(also see CONTRIBUTING.rst for details)

• wrote descriptive pull request text
• added/updated test(s)
• updated/extended the documentation
• added relevant issue keyword
  in message body
• added news fragment in changelog folder
  • fragment name: <issue number>.<type>.rst for example (588.bugfix.rst)
  • <type> is must be one of bugfix, feature, deprecation,breaking, doc, misc
  • if PR has no issue: consider creating one first or change it to the PR number after creating the PR
  • "sign" fragment with "by :user:<your username>"
  • please use full sentences with correct case and punctuation, for example: "Fix issue with non-ascii contents in doctest text files - by :user:superuser."
  • also see examples
• added yourself to CONTRIBUTORS (preserving alphabetical order)

[asottile]

I think towncrier had some sort of regression 🤷

[webknjaz]

I think towncrier had some sort of regression

Most likely, the latest version at least, has a regression in adding the title that was exposed as a difference between normal and --draft runs in sphinxcontrib-towncrier: sphinx-contrib/sphinxcontrib-towncrier#48 (comment).