Bump pygments from 2.4.0 to 2.7.4

Bumps [pygments](https://github.com/pygments/pygments) from 2.4.0 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.4.0...2.7.4)

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

Author: dependabot[bot]

requirements.txt

@@ -45,7 +45,7 @@ py==1.10.0
 PyBabel-hbs==0.2.2
 pycountry==18.12.8
 pycparser==2.19
-Pygments==2.5.2
+Pygments==2.7.4
 pymongo==3.2.2
 pyparsing==2.4.7
 PyPDF2==1.25.1