Bump github.com/go-kit/log from 0.2.0 to 0.2.1

Bumps [github.com/go-kit/log](https://github.com/go-kit/log) from 0.2.0 to 0.2.1.
- [Release notes](https://github.com/go-kit/log/releases)
- [Commits](https://github.com/go-kit/log/compare/v0.2.0...v0.2.1

)

---
updated-dependencies:
- dependency-name: github.com/go-kit/log
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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