Fix serialized output formats from local .whl files

[wimglenn]

make sure local wheel version is recognized as "available" even if not in the index. closes #105

[codecov[bot]]

Codecov Report

Merging #106 (f841eb5) into main (0965f38) will increase coverage by 0.06%. The diff coverage is 95.00%.

@@            Coverage Diff             @@
##             main     #106      +/-   ##
==========================================
+ Coverage   91.86%   91.92%   +0.06%     
==========================================
  Files           9        9              
  Lines         713      731      +18     
  Branches      135      141       +6     
==========================================
+ Hits          655      672      +17     
  Misses         42       42              
- Partials       16       17       +1     

Impacted Files	Coverage Δ
johnnydep/lib.py	97.77% <94.73%> (-0.18%)	:arrow_down:
johnnydep/__init__.py	100.00% <100.00%> (ø)

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