Bump jinja2 from 2.7.2 to 2.11.3

Bumps [jinja2](https://github.com/pallets/jinja) from 2.7.2 to 2.11.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/master/CHANGES.rst)
- [Commits](pallets/jinja@2.7.2...2.11.3)

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

requirements-dev.txt

@@ -1,4 +1,4 @@
-Jinja2==2.7.2
+Jinja2==2.11.3
 MarkupSafe==0.19
 Pygments==1.6
 Sphinx==1.2.2