Bump pygments in /公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse

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)

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

公开课/文档/年薪50W+的Python程序员如何写代码/code/Python/opencourse/requirements.txt

@@ -23,7 +23,7 @@ pickleshare==0.7.5
 prompt-toolkit==3.0.5
 psutil==5.7.0
 ptyprocess==0.6.0
-Pygments==2.6.1
+Pygments==2.7.4
 pylint==2.4.4
 python-dateutil==2.8.1
 pytz==2019.3