24 Sep 2018
Major changes:
- Update `pip-tools` for native `pip` 8, 9, 10 and 18 compatibility, un-vendoring `pip`
to use the user-installed `pip`
([657](https://github.com/jazzband/pip-tools/pull/657) and
[672](https://github.com/jazzband/pip-tools/pull/672)). Thanks to techalchemy,
suutari, tysonclugg and vphilippon for contributing on this.
Features:
- Removed the dependency on the external library `first`
([676](https://github.com/jazzband/pip-tools/pull/676)). Thanks jdufresne