Bump the versio

Bump the version

The coverage version shouldn't matter, but why not use the latest?

The plugin version fixes an encoding issue.

https://github.com/edx/edx-proctoring/pull/622

Bump the version for XBlock.

Bump the version for edx-completion

- Upgrade edx-drf-extensions to 2.4.5
- Removed constraint to 2.4.0, because 2.4.2 introduces a workaround for
ARCH-1210 by putting the problematic code behind a django setting.
- Remove unused JWT_AUTH_REFRESH_COOKIE setting.

ARCH-418, ARCH-1269, ARCH-1044

fix broken toggle

guincorn just released its version on 9th-nov-2019 (20.0.0)
and it requires Python 3.x >= 3.4.
so adding constraint < 20.0.0

execute make upgrade

Bump the version.

This reverts commit 31a3a6cb.

* Upgraded dependencies