Bump pygments from 2.6.1 to 2.7.4 (#408)

Bumps [pygments](https://github.com/pygments/pygments) from 2.6.1 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](https://github.com/pygments/pygments/compare/2.6.1...2.7.4)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -59,7 +59,7 @@ py==1.8.0
 py2app==0.21
 pycparser==2.20
 pyfiglet==0.8.post1
-Pygments==2.6.1
+Pygments==2.7.4
 PyInstaller==3.6
 pyinstaller-setuptools==2019.3
 pylint==2.3.1