Bump regex from 1.5.4 to 1.5.5

Bumps [regex](https://github.com/rust-lang/regex) from 1.5.4 to 1.5.5.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](rust-lang/regex@1.5.4...1.5.5)

---
updated-dependencies:
- dependency-name: regex
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.lock

@@ -10,7 +10,7 @@ license = "MIT"
 
 [dependencies]
 termion = "1.5"
-regex = "1.3.1"
+regex = "1.5.5"
 clap = "2.33.0"
 base64 = "0.13.0"
 unicode-width = "0.1.7"