Feature/swi 42 add new source for voting posters

[Tschuppi81]

Swissvotes: Adds Plakatsammlung Basel as new source for voting posters

TYPE: Feature
LINK: SWI-42

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 89.08%. Comparing base (04d072f) to head (20c2b38).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/onegov/swissvotes/views/votes.py	50.00%	2 Missing ⚠️
src/onegov/swissvotes/cli.py	91.66%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/swissvotes/app.py	100.00% <100.00%> (ø)
...c/onegov/swissvotes/external_resources/__init__.py	100.00% <100.00%> (ø)
...rc/onegov/swissvotes/external_resources/posters.py	99.03% <100.00%> (+0.11%)	⬆️
src/onegov/swissvotes/forms/external_resources.py	100.00% <100.00%> (ø)
src/onegov/swissvotes/models/column_mapper.py	98.59% <ø> (ø)
src/onegov/swissvotes/models/vote.py	98.30% <100.00%> (+0.01%)	⬆️
src/onegov/swissvotes/cli.py	97.35% <91.66%> (-0.50%)	⬇️
src/onegov/swissvotes/views/votes.py	96.90% <50.00%> (-2.02%)	⬇️

... and 1 file with indirect coverage changes

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