Bump pygments from 2.1.3 to 2.7.4

Bumps [pygments](https://github.com/pygments/pygments) from 2.1.3 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.1.3...2.7.4)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -47,7 +47,7 @@ pycparser==2.19
 ## pycrypto disabled as no remidiation exists
 #pycrypto==2.6.1
 pycuber==0.2.0
-Pygments==2.1.3
+Pygments==2.7.4
 PyNaCl==1.3.0
 pyparsing==2.0.7
 PyPDF2==1.25.1