Bump h2 from 0.1.22 to 0.1.23
Bump h2 from 0.1.22 to 0.1.23

Bumps [h2](https://github.com/hyperium/h2) from 0.1.22 to 0.1.23.
- [Release notes](https://github.com/hyperium/h2/releases)
- [Changelog](https://github.com/hyperium/h2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/hyperium/h2/compare/v0.1.22...v0.1.23)
alex/otp-cop