add default keyword to schema annotations

[losisin]

closes #33

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.62%. Comparing base (361856d) to head (90e6bd1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   98.58%   98.62%   +0.04%     
==========================================
  Files           6        6              
  Lines         423      434      +11     
==========================================
+ Hits          417      428      +11     
  Misses          4        4              
  Partials        2        2              

Flag	Coverage Δ
unittests	98.62% <100.00%> (+0.04%)	⬆️

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