organization image (fixes #1068)

[kristhina]

No description provided.

[codecov]

Codecov Report

Merging #1095 into master will increase coverage by 0.04%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##           master    #1095      +/-   ##
==========================================
+ Coverage   91.49%   91.53%   +0.04%     
==========================================
  Files         119      120       +1     
  Lines        2904     2919      +15     
  Branches       32       32              
==========================================
+ Hits         2657     2672      +15     
  Misses        243      243              
  Partials        4        4

Impacted Files	Coverage Δ
...volontulo/management/commands/populate_database.py	100% <100%> (ø)	⬆️
...lontulo/tests/views/api/organizations/test_list.py	100% <100%> (ø)	⬆️
backend/apps/volontulo/models.py	97.87% <100%> (+0.09%)	⬆️
...lontulo/tests/views/api/organizations/test_read.py	100% <100%> (ø)	⬆️
...ps/volontulo/migrations/0018_organization_image.py	100% <100%> (ø)
backend/apps/volontulo/factories.py	97.97% <100%> (+0.02%)	⬆️
backend/apps/volontulo/tests/common.py	100% <100%> (ø)	⬆️
backend/apps/volontulo/serializers.py	92.56% <83.33%> (+0.05%)	⬆️

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