Bump regex from 1.1.5 to 1.1.6
Bumps [regex](https://github.com/rust-lang/regex) from 1.1.5 to 1.1.6.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/regex/compare/1.1.5...1.1.6)
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