Update django-redis to 4.4.4

[pyup-bot]

There's a new version of django-redis available.
You are currently using 4.3.0. I have updated it to 4.4.4

Changelog

4.4.4

---

Date: 2016-07-25

• Fix possible race condition on incr implementation using
  lua script (thanks to prokaktus).

4.4.3

---

Date: 2016-05-17

• Fix minor ttl inconsistencies.

4.4.2

---

Date: 2016-04-21

• Fix timeout bug (thanks to skorokithakis)

4.4.1

---

Date: 2016-04-13

• Add additional check for avoid wrong exception on get_redis_connection.

4.4.0

---

Date: 2016-04-12

• Make redis client pluggable (thanks to arnuschky)
• Add version number inside python module (thanks to BertrandBordage)
• Fix clear method (thanks to ostcar)
• Add the ability to specify key prefix on delete and delete_pattern.
• BREAKING CHANGE: improved compression support (make it more plugable).

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

Happy merging! 🤖

[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #118 into master will not change coverage

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