Update dependencies (#80)
Update dependencies (#80)

Bumps [credo](https://github.com/rrrene/credo) from 1.1.3 to 1.1.4.
- [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/v1.1.3...v1.1.4)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Bump earmark from 1.3.5 to 1.4.0

Bumps [earmark](https://github.com/pragdave/earmark) from 1.3.5 to 1.4.0.
- [Release notes](https://github.com/pragdave/earmark/releases)
- [Changelog](https://github.com/pragdave/earmark/blob/master/RELEASE.md)
- [Commits](https://github.com/pragdave/earmark/compare/v1.3.5...v1.4.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Bump ex_doc from 0.21.1 to 0.21.2

Bumps [ex_doc](https://github.com/elixir-lang/ex_doc) from 0.21.1 to 0.21.2.
- [Release notes](https://github.com/elixir-lang/ex_doc/releases)
- [Changelog](https://github.com/elixir-lang/ex_doc/blob/master/CHANGELOG.md)
- [Commits](https://github.com/elixir-lang/ex_doc/compare/v0.21.1...v0.21.2)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Dalgona/Serum