Bump2version

- Updated the readme to markdown for easier maintainability
- Fixed travis testing, thanks: sharksforarms 15
- Added support for newlines, thanks: sharksforarms 14
- Fixed an issue with a TypeError on Windows, thanks: lorengordon 12
- Standardised the python versions, thanks: ekohl 8
- Fixed testing for pypy, 7

- Added support for signing tags (git tag -s)
thanks: Californian [6](https://github.com/c4urself/bump2version/pull/6)

- Added compatibility with `bumpversion` by making script install as `bumpversion` as well
thanks: the-allanc [2](https://github.com/c4urself/bump2version/pull/2)

- Added support for annotated tags
thanks: ekohl gvangool [58](https://github.com/peritus/bumpversion/pull/58)

- Renamed to bump2version to ensure no conflicts with original package

- Fix bug where `--new-version` value was not used when config was present
(thanks cscetbon ecordell [60](https://github.com/peritus/bumpversion/pull/60)
- Preserve case of keys config file
(thanks theskumar [75](https://github.com/peritus/bumpversion/pull/75)
- Windows CRLF improvements (thanks thebjorn)