Bump h2 from 0.2.2 to 0.2.3 (#496)
Bump h2 from 0.2.2 to 0.2.3 (#496)

Bumps [h2](https://github.com/hyperium/h2) from 0.2.2 to 0.2.3.
- [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/v0.2.2...v0.2.3)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
alex/otp-cop