Bump credo from 1.6.6 to 1.6.7
Bump credo from 1.6.6 to 1.6.7

Bumps [credo](https://github.com/rrrene/credo) from 1.6.6 to 1.6.7.
- [Release notes](https://github.com/rrrene/credo/releases)
- [Changelog](https://github.com/rrrene/credo/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rrrene/credo/compare/v1.6.6...v1.6.7)

---
updated-dependencies:
- dependency-name: credo
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
nerves-project/nerves,nerves-project/nerves