Fix po2md errors with unicode line breaks wrapping

[mondeja]

Fixes #153

[codecov]

Codecov Report

Base: 97.84% // Head: 97.61% // Decreases project coverage by -0.23% ⚠️

Coverage data is based on head (42be09c) compared to base (2f3ae48).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #274      +/-   ##
==========================================
- Coverage   97.84%   97.61%   -0.23%     
==========================================
  Files          19       19              
  Lines        2135     1974     -161     
==========================================
- Hits         2089     1927     -162     
- Misses         46       47       +1     

Impacted Files	Coverage Δ
src/mdpo/md.py	100.00% <ø> (ø)
src/mdpo/mdpo2html/__init__.py	98.41% <ø> (ø)
src/mdpo/text.py	100.00% <ø> (ø)
src/mdpo/po2md/__init__.py	98.08% <100.00%> (-0.21%)	⬇️

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