v0.29.2

Added

• A GitHub Actions workflow runs scripts/check-qml.sh and shellcheck on every pull request into
  develop (#132, #143).
• A tag vX.Y.Z now creates the GitHub release by workflow. It first checks that the tag equals
  the plugin.json version, that the commit is on develop or a release/* branch and was green as a pull request, and that
  CHANGELOG.md has a section for the version; the release notes are that section (#138). A dry run says when the
  tag or release already exists. CI checks that the plugin.json version has a CHANGELOG section
  (#140).

Changed

• README: the contributing note says that CI runs the QML check and that a change lands on develop
  only after its required check is green (#136, #143).
• Work lands on develop; main, which dms plugins update installs, only moves to released
  versions: GitHub accepts a push to main only for a commit the release workflow marked
  released. Renovate opens its pull requests against develop (#143).
• plugin.json states the upper bound the startup check enforces since 0.28.0: obsbot4linux 0.7.3
  or newer, before 1.0. obsbot4linux 1.0 needs widget 1.0 (#145).