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Features
- Add support for `prepare-commit-msg` hook
- 1004 PR by marcjay.
Fixes
- Fix repeated legacy `pre-commit install` on windows
- 1010 issue by AbhimanyuHK.
- 1011 PR by asottile.
- Whitespace fixup
- 1014 PR by mxr.
- Fix CI check for working pcre support
- 1015 PR by Myrheimb.
Misc.
- Switch CI from travis / appveyor to azure pipelines
- 1012 PR by asottile.