Bump jinja2 from 2.10 to 2.11.3 in /lib

Bumps [jinja2](https://github.com/pallets/jinja) from 2.10 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@2.10...2.11.3)

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

Author: dependabot[bot]

lib/requirements.txt

@@ -42,7 +42,7 @@ Flask_MongoAlchemy == 0.7.2
 # .env/lib/python3.6/site-packages/jinja2/tests.py: 15
 # .env/lib/python3.6/site-packages/jinja2/utils.py: 16,101,117,118,240
 # .env/lib/python3.6/site-packages/jinja2/visitor.py: 11
-Jinja2 == 2.10
+Jinja2 == 2.11.3
 
 # .env/lib/python3.6/site-packages/jinja2/sandbox.py: 23
 # .env/lib/python3.6/site-packages/jinja2/utils.py: 647