Bump colorama from 0.4.1 to 0.4.3

Bumps [colorama](https://github.com/tartley/colorama) from 0.4.1 to 0.4.3.
- [Release notes](https://github.com/tartley/colorama/releases)
- [Changelog](https://github.com/tartley/colorama/blob/master/CHANGELOG.rst)
- [Commits](tartley/colorama@0.4.1...0.4.3)

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

requirements.txt

@@ -5,7 +5,7 @@ certifi==2019.11.28
 cffi==1.13.2
 chardet==3.0.4
 colander==1.7.0
-colorama==0.4.1
+colorama==0.4.3
 cornice==4.0.1
 cornice-swagger==0.7.0
 dockerflow==2019.10.0