Update dependency Jinja2 to v2.10.3

Author: renovate-bot

requirements.txt

@@ -9,7 +9,7 @@ Flask-SQLAlchemy==2.2
 idna==2.6
 ipfsapi==0.4.2.post1
 itsdangerous==0.24
-Jinja2==2.9.6
+Jinja2==2.10.3
 Mako==1.0.7
 MarkupSafe==1.0
 python-dateutil==2.6.1