Bump diff from 3.3.1 to 3.5.0
Bump diff from 3.3.1 to 3.5.0

Bumps [diff](https://github.com/kpdecker/jsdiff) from 3.3.1 to 3.5.0.
- [Release notes](https://github.com/kpdecker/jsdiff/releases)
- [Changelog](https://github.com/kpdecker/jsdiff/blob/master/release-notes.md)
- [Commits](https://github.com/kpdecker/jsdiff/compare/v3.3.1...v3.5.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
fortes/metalsmith-code-highlight