32 bug formatter cannot be implemented due to responseunit being private

[Atmelfan]

Fixes #32

[codecov]

Codecov Report

Attention: Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.84%. Comparing base (89353e6) to head (1cd8b7e).

Files with missing lines	Patch %	Lines
scpi/src/lib.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
- Coverage   76.04%   73.84%   -2.20%     
==========================================
  Files          27       27              
  Lines        2592     2275     -317     
==========================================
- Hits         1971     1680     -291     
+ Misses        621      595      -26     

Flag	Coverage Δ
unittests	73.84% <96.96%> (-2.20%)	⬇️

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