Bump regex from 1.5.5 to 1.5.6 (#184)

Bumps [regex](https://github.com/rust-lang/regex) from 1.5.5 to 1.5.6.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/regex/compare/1.5.5...1.5.6)

---
updated-dependencies:
- dependency-name: regex
  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>
Co-authored-by: Dave G <davegallant@gmail.com>

Cargo.toml

@@ -13,7 +13,7 @@ tokio = { version = "1.15", features = ["full"] }
 serde_json = "1.0.68"
 log = "0.4"
 pretty_env_logger = "0.4.0"
-regex = "1.5.4"
+regex = "1.5.6"
 rust-crypto = "^0.2"
 sled = "0.34.7"
 clap = "2.34.0"