Bump pygments from 2.0.2 to 2.7.4

Bumps [pygments](https://github.com/pygments/pygments) from 2.0.2 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.0.2...2.7.4)

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

requirements.txt

@@ -16,7 +16,7 @@ lxml==4.6.2
 MarkupSafe==0.23
 pbr==1.8.1
 py==1.4.31
-Pygments==2.0.2
+Pygments==2.7.4
 pylint==1.5.3
 pytest==2.9.2
 pytest-asyncio==0.4.1