Merge branch '199-fail-to-install-django-nested-admin' into 'master'

Resolve "Fail to install django-nested-admin"

Closes #199

See merge request !214
3 jobs for 200-import-representatives-from-older-constituencies-in-francedata in 14 minutes and 18 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #1789
memopol
docs build

00:01:51

passed #1788
memopol
qa checks

00:02:04

passed #1787
memopol
unit tests

00:10:23

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