Added test of release retrieval

[codecov[bot]]

Codecov Report

Merging #102 (8a064d7) into main (ba37b2e) will decrease coverage by 0.76%. Report is 1 commits behind head on main. The diff coverage is 46.00%.

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
- Coverage   55.44%   54.68%   -0.76%     
==========================================
  Files          10       10              
  Lines         579      629      +50     
==========================================
+ Hits          321      344      +23     
- Misses        226      249      +23     
- Partials       32       36       +4     

Files	Coverage Δ
usercollection.go	86.95% <ø> (ø)
testdiscogs.go	0.00% <0.00%> (ø)
releases.go	56.36% <52.27%> (-16.37%)	:arrow_down: