Improve Imgur tests

[pajlada]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

This also ensures that we handle bad api responses more

• Improve imgur tests
• add changelog entry

[codecov]

Codecov Report

Merging #289 (c1820f7) into master (0362f87) will increase coverage by 3.72%.
The diff coverage is 97.14%.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   53.03%   56.76%   +3.72%     
==========================================
  Files          57       57              
  Lines        1727     1737      +10     
==========================================
+ Hits          916      986      +70     
+ Misses        784      727      -57     
+ Partials       27       24       -3     

Impacted Files	Coverage Δ
internal/resolvers/imgur/helpers.go	96.00% <50.00%> (+26.37%)	⬆️
internal/resolvers/imgur/initialize.go	100.00% <100.00%> (+100.00%)	⬆️
internal/resolvers/imgur/loader.go	100.00% <100.00%> (+24.48%)	⬆️
internal/resolvers/imgur/resolver.go	100.00% <100.00%> (+90.90%)	⬆️

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[pajlada]

👍