Bump structopt from 0.3.21 to 0.3.23 (#104)

Bumps [structopt](https://github.com/TeXitoi/structopt) from 0.3.21 to 0.3.23.
- [Release notes](https://github.com/TeXitoi/structopt/releases)
- [Changelog](https://github.com/TeXitoi/structopt/blob/master/CHANGELOG.md)
- [Commits](TeXitoi/structopt@v0.3.21...v0.3.23)

---
updated-dependencies:
- dependency-name: structopt
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -7,7 +7,7 @@ license = "MIT"
 readme = "README.md"
 
 [dependencies]
-structopt = "0.3.21"
+structopt = "0.3.23"
 anyhow = "1.0.40"
 rayon = "1.5.1"
 pulldown-cmark = "0.8.0"