Allow overriding exceptions

[flying-sheep]

Fixes #15

[codecov]

Codecov Report

Merging #16 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   84.14%   84.19%   +0.04%     
==========================================
  Files           8        8              
  Lines         328      329       +1     
==========================================
+ Hits          276      277       +1     
  Misses         52       52              

Impacted Files	Coverage Δ
scanpydoc/elegant_typehints/formatting.py	96.38% <100.00%> (+0.04%)	⬆️

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