Bump2version

- Added: enable special characters in search/replace, thanks mckelvin
- Added: allow globbing a pattern to match multiple files, thanks balrok
- Added: way to only bump a specified file via --no-configured-files, thanks balrok
- Fixed: dry-run now correctly outputs, thanks fmigneault
- Housekeeping: documentation for lightweight tags improved, thanks GreatBahram
- Housekeeping: added related tools document, thanks florisla
- Fixed: no more falling back to default search, thanks florisla

- Fix the spurious newline that bump2version adds when writing to bumpversion.cfg, thanks kyluca 58
- Add Python3.8 support, thanks florisla
- Drop Python2 support, thanks hugovk
- Allow additional arguments to the commit call, thanks lubomir
- Various documentation improvements, thanks lubomir florisla padamstx glotis
- Housekeeping, move changelog into own file

- Housekeeping, also publish an sdist
- Housekeeping, fix appveyor builds
- Housekeeping, `make lint` now lints with pylint
- Drop support for Python3.4, thanks hugovk 79
- Enhance missing VCS command detection (errno 13), thanks lowell80 75
- Add environment variables for other scripts to use, thanks mauvilsa 70
- Refactor, cli.main is now much more readable, thanks florisla 68
- Fix, retain file newlines for Windows, thanks hesstobi 59
- Add support (tests) for Pythno3.7, thanks florisla 49
- Allow any part to be configured in configurable strings such as tag_name etc., thanks florisla 41

- Housekeeping, use twine

- Fixed windows appveyor-based testing, thanks: jeremycarroll 33 and 34
- Fixed interpolating correctly when using setup.cfg for config, thanks: SethMMorton 32
- Improve tox/travis testing, thanks: ekohl 27
- Fixed markdown formatting in setup.py for pypi.org documentation, thanks: florisla, Mattwmaster58 26