✨ better error handler for file permission denied in copying…

[chfw]

…. fix #143

[codecov-io]

Codecov Report

Merging #144 into dev will increase coverage by 0.01%.
The diff coverage is 90.32%.

@@            Coverage Diff             @@
##              dev     #144      +/-   ##
==========================================
+ Coverage   98.31%   98.33%   +0.01%     
==========================================
  Files          39       39              
  Lines        1840     1857      +17     
==========================================
+ Hits         1809     1826      +17     
  Misses         31       31

Impacted Files	Coverage Δ
moban/_version.py	100% <100%> (ø)	⬆️
tests/test_copier.py	100% <100%> (ø)	⬆️
moban/utils.py	95.2% <100%> (ø)	⬆️
moban/copier.py	98.76% <100%> (+0.11%)	⬆️
tests/test_hash_store.py	98.88% <66.66%> (ø)	⬆️
tests/test_utils.py	97.84% <66.66%> (ø)	⬆️

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