Update jinja2 to 2.10

[pyup-bot]

There's a new version of jinja2 available.
You are currently using 2.9.6. I have updated it to 2.10

These links might come in handy: PyPI | Changelog | Homepage

Changelog

2.10

---

(feature release, release date to be decided)

• Added a new extension node called OverlayScope which can be used to
  create an unoptimized scope that will look up all variables from a
  derived context.
• Added an in test that works like the in operator. This can be used
  in combination with reject and select.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖