Bump hex from 0.3.2 to 0.4.0 (#141)
Bump hex from 0.3.2 to 0.4.0 (#141)

Bumps [hex](https://github.com/KokaKiwi/rust-hex) from 0.3.2 to 0.4.0.
- [Release notes](https://github.com/KokaKiwi/rust-hex/releases)
- [Commits](https://github.com/KokaKiwi/rust-hex/commits)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
alex/ct-tools,alex/ct-tools