Bump pygments from 2.0.1 to 2.7.4

Bumps [pygments](https://github.com/pygments/pygments) from 2.0.1 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.0.1...2.7.4)

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

requirements.txt

@@ -19,7 +19,7 @@ pip==9.0.1
 pytz==2012c
 requests>=2.8.1
 Twisted==15.5.0
-Pygments==2.0.1
+Pygments==2.7.4
 SQLAlchemy>=1.1
 pyOpenSSL==17.0.0
 python_dateutil==2.6.0