0.12.0 release

- Contrib Rules: community-contributed rules that are disabled by default, but
  can be enabled through configuration. Contrib rules are meant to augment
  default gitlint behavior by providing users with rules for common use-cases
  without forcing these rules on all gitlint users.
    - New Contrib Rule: contrib-title-conventional-commits enforces the
      Conventional Commits spec.
    - New Contrib Rule: cc1-contrib-requires-signed-off-by ensures that all
      commit messages contain a Sign-Off-By line.
- Experimental Windows support: Basic functionality is working, but there are
  some caveats.
- Python 3.3 no longer supported. Python 3.4 is likely to follow in a future
  release as it has reached EOL as well.
- PyPy 3.5 supported
- Support for --ignore-stdin command-line flag to ignore any text send via stdin
- Bugfixes:
  - Can't use install-hooks in with git worktree
  - gitlint failed with configured commentchar
- Under-the-hood: dependencies updated, experimental Dockerfile, github issue
  template.

Full Release details in CHANGELOG.md.

Author: jorisroovers

gitlint/__init__.py

@@ -1 +1 @@
-__version__ = "0.12.0dev"
+__version__ = "0.12.0"