Bump mio from 0.6.21 to 0.6.22 (#548)
Bump mio from 0.6.21 to 0.6.22 (#548)

Bumps [mio](https://github.com/tokio-rs/mio) from 0.6.21 to 0.6.22.
- [Release notes](https://github.com/tokio-rs/mio/releases)
- [Changelog](https://github.com/tokio-rs/mio/blob/v0.6.22/CHANGELOG.md)
- [Commits](https://github.com/tokio-rs/mio/compare/v0.6.21...v0.6.22)

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

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