Bump colorful from 0.5.4 to 0.5.6

Bumps [colorful](https://github.com/timofurrer/colorful) from 0.5.4 to 0.5.6.
- [Release notes](https://github.com/timofurrer/colorful/releases)
- [Changelog](https://github.com/timofurrer/colorful/blob/master/CHANGELOG.md)
- [Commits](timofurrer/colorful@v0.5.4...v0.5.6)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 radish-bdd==0.13.1
 gitpython==3.1.20
 netaddr==0.8.0
-colorful==0.5.4
+colorful==0.5.6
 filetype==1.2.0
 junit-xml==1.9
 emoji==2.2.0

requirements_dev.txt

@@ -2,7 +2,7 @@ radish-bdd==0.13.1
 mock==5.1.0
 gitpython==3.1.20
 netaddr==0.8.0
-colorful==0.5.4
+colorful==0.5.6
 filetype==1.2.0
 junit-xml==1.9
 emoji==2.2.0