Bump pygments from 2.2.0 to 2.7.4

Bumps [pygments](https://github.com/pygments/pygments) from 2.2.0 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.2.0...2.7.4)

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

Author: dependabot[bot]

requirements.txt

@@ -74,7 +74,7 @@ pycparser==2.21
 pydocstyle==5.0.1
 pyfcm==1.4.5
 pyflakes==2.1.1
-Pygments==2.2.0
+Pygments==2.7.4
 PyJWT==1.7.1
 pylama==7.7.1
 pylint==1.8.4