Fix incorrect EOL normalization in some cases

[Mingun]

Whew working on #379 I found that normalization was incorrectly handle multi-byte characters, for example, Euro character €. It is encoded in UTF-8 as e2 82 ac and previously would be replaced by \n

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.78%. Comparing base (38b44d4) to head (b26e2f4).
⚠️ Report is 1 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #887      +/-   ##
==========================================
+ Coverage   55.52%   55.78%   +0.25%     
==========================================
  Files          42       42              
  Lines       15511    15602      +91     
==========================================
+ Hits         8613     8704      +91     
  Misses       6898     6898              

Flag	Coverage Δ
unittests	55.78% <100.00%> (+0.25%)	⬆️

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