Fix initialization of singular objects

[iamanikeev]

No description provided.

[Stranger6667]

Please, add a changelog entry

[codecov]

Codecov Report

Merging #63 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
+ Coverage   99.76%   99.76%   +<.01%     
==========================================
  Files          12       12              
  Lines         421      424       +3     
  Branches       48       49       +1     
==========================================
+ Hits          420      423       +3     
  Partials        1        1

Impacted Files	Coverage Δ
pyoffers/api.py	99.09% <100%> (+0.02%)	⬆️

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[iamanikeev]

Added changelog entry