escaping user provided variables in Jinja templates

Bump pytest from 5.1.2 to 5.3.1

Bump gunicorn from 19.9.0 to 20.0.4

Bump sqlalchemy from 1.3.8 to 1.3.11

Fix i18n command typo in readme

Bump flask-sqlalchemy from 2.4.0 to 2.4.1

Bump flask-limiter from 1.0.1 to 1.1.0

Bump werkzeug from 0.15.6 to 0.16.0

Bump jinja2 from 2.10.1 to 2.10.2

Bump faker from 2.0.1 to 2.0.2

Bump arrow from 0.14.5 to 0.15.2

Bump werkzeug from 0.15.5 to 0.15.6

Bump sqlalchemy from 1.3.7 to 1.3.8

Bump pytest from 5.1.1 to 5.1.2

Bump pytest from 5.1.0 to 5.1.1