Merge branch 'django-upgrade' into 'develop'

Updated to django 2.2.4

See merge request funkwhale/funkwhale!849
6 jobs for doc-docker-compose in 4 minutes and 16 seconds (queued for 1 second)
Status Job ID Name Coverage
  Review
manual #26920
docker allowed to fail manual
review_docs
manual #26919
docker allowed to fail manual
review_front
 
  Lint
passed #26921
black

00:00:37

passed #26922
flake8

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  Test
passed #26923
docker
test_api

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passed #26924
docker
test_front

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