Bumps [github.com/mattn/go-isatty](https://github.com/mattn/go-isatty) from 0.0.19 to 0.0.20.
- [Commits](https://github.com/mattn/go-isatty/compare/v0.0.19...v0.0.20)

---
updated-dependencies:
- dependency-name: github.com/mattn/go-isatty
  dependency-type: direct:production
  update-type: version-update:semver-patch
...
Signed-off-by: dependabot[bot] <support@github.com>