Bump pygments from 2.4.2 to 2.7.4 in /getting-started

Bumps [pygments](https://github.com/pygments/pygments) from 2.4.2 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.4.2...2.7.4)

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

getting-started/requirements.txt

@@ -39,7 +39,7 @@ pickleshare==0.7.5
 prometheus-client==0.7.1
 prompt-toolkit==2.0.10
 ptyprocess==0.6.0
-Pygments==2.4.2
+Pygments==2.7.4
 pyrsistent==0.15.5
 python-dateutil==2.8.1
 pytz==2019.3