Bumps [aws-sigv4](https://github.com/aws/aws-sdk-ruby) from 1.1.1 to 1.1.2.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/master/gems/aws-sigv4/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/compare/1.1.1...1.1.2

)

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