Bump log from 0.4.5 to 0.4.6
Bump log from 0.4.5 to 0.4.6

Bumps [log](https://github.com/rust-lang/log) from 0.4.5 to 0.4.6.
- [Release notes](https://github.com/rust-lang/log/releases)
- [Changelog](https://github.com/rust-lang-nursery/log/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/log/compare/0.4.5...0.4.6)
cstorey/mio-rules-example