Merge pull request #73 from nexB/dependabot/pip/docs/pygments-2.7.4

Bump pygments from 2.4.2 to 2.7.4 in /docs

Author: pombredanne

docs/requirements.txt

@@ -10,7 +10,7 @@ Jinja2==2.11.3
 MarkupSafe==1.1.1
 packaging==19.2
 pbr==5.4.3
-Pygments==2.4.2
+Pygments==2.7.4
 pyparsing==2.4.2
 pytz==2019.3
 requests==2.22.0