Bump fern from 0.5.9 to 0.6.0

Bumps [fern](https://github.com/daboross/fern) from 0.5.9 to 0.6.0.
- [Release notes](https://github.com/daboross/fern/releases)
- [Changelog](https://github.com/daboross/fern/blob/master/CHANGELOG.md)
- [Commits](https://github.com/daboross/fern/compare/fern-0.5.9...fern-0.6.0)

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

Cargo.lock

@@ -998,11 +998,10 @@ checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 
 [[package]]
 name = "fern"
-version = "0.5.9"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e69ab0d5aca163e388c3a49d284fed6c3d0810700e77c5ae2756a50ec1a4daaa"
+checksum = "8c9a4820f0ccc8a7afd67c39a0f1a0f4b07ca1725164271a64939d7aeb9af065"
 dependencies = [
- "chrono",
  "log 0.4.11",
 ]