Make possible to run source files like python files

[mniak]

No description provided.

[codecov]

Codecov Report

Merging #41 (18ff65b) into master (1f9ef12) will increase coverage by 1.65%.
The diff coverage is n/a.

❗ Current head 18ff65b differs from pull request most recent head c83af36. Consider uploading reports for the commit c83af36 to get more accurate results

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   55.85%   57.51%   +1.65%     
==========================================
  Files          16       16              
  Lines         256      266      +10     
==========================================
+ Hits          143      153      +10     
  Misses        101      101              
  Partials       12       12              

Impacted Files	Coverage Δ
impl/builder.go	92.00% <0.00%> (+5.33%)	⬆️

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