ctz / rustls / 610

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Pull #202

travis-ci

Update env_logger requirement from 0.5 to 0.6

Updates the requirements on [env_logger](https://github.com/sebasmagri/env_logger) to permit the latest version.
- [Release notes](https://github.com/sebasmagri/env_logger/releases)
- [Commits](https://github.com/sebasmagri/env_logger/commits/v0.6.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

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