0.13.0 release

- Behavior Change: Revert Commits are now recognized and ignored by default #99
- --staged flag: gitlint can now detect meta-data (such as author details,
  changed files, etc) of staged/pre-commits. Useful when you use gitlint's
  commit-msg hook or precommit (#105)
- New branch properties on GitCommit and GitContext, useful when writing your
  own user-defined rules: commit.branches and commit.context.current_branch #108
- Python 3.8 support
- Python 3.4 no longer supported. Python 3.4 has reached EOL and an increasing
  of gitlint's dependencies have dropped support which makes it hard to maintain
- Improved Windows support: better unicode handling.
- Bugfixes:
  - Gitlint no longer crashes when acting on empty repositories (this only
    occurred in specific circumstances).
  - Changed files are now better detected in repos that only have a root commit
- Improved performance and memory (gitlint now caches git properties)
- Improved --debug output
- Improved documentation
- Under-the-hood: dependencies updated, unit and integration test improvements,
  migrated from TravisCI to Github Actions.

Full Release details in CHANGELOG.md.

gitlint/__init__.py

@@ -1 +1 @@
-__version__ = "0.13.0dev"
+__version__ = "0.13.0"