cargo: bump clap_mangen from 0.1.4 to 0.1.6

Bumps [clap_mangen](https://github.com/clap-rs/clap) from 0.1.4 to 0.1.6.
- [Release notes](https://github.com/clap-rs/clap/releases)
- [Changelog](https://github.com/clap-rs/clap/blob/master/CHANGELOG.md)
- [Commits](https://github.com/clap-rs/clap/compare/clap_mangen-v0.1.4...clap_mangen-v0.1.6)

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

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

Cargo.lock

@@ -266,9 +266,9 @@ dependencies = [
 
 [[package]]
 name = "clap_mangen"
-version = "0.1.4"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4f074844a73b09dcdf2d972e86d78c0d11ac6e792bd941218d004e9541a62f7b"
+checksum = "ca2ff85c3fa1e7c1a4229f7b4221f769757c3982e2afd3e6d9381d59db2c7e61"
 dependencies = [
  "clap 3.1.10",
  "roff",