fix: add UTF8 file encoding option to snap

[lupino3]

Will help with #785

[codecov-commenter]

Codecov Report

Merging #857 (0bbcd9a) into master (c993dfd) will not change coverage.
The diff coverage is n/a.

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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #857   +/-   ##
=========================================
  Coverage     52.05%   52.05%           
  Complexity     1452     1452           
=========================================
  Files           251      251           
  Lines         10232    10232           
  Branches       1099     1099           
=========================================
  Hits           5326     5326           
  Misses         4585     4585           
  Partials        321      321           

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