Use UTF-8 on Windows to read directory entries

[avdv]

Description

Thanks for contributing this Pull Request. Add a brief description of what this Pull Request does. Do tag the relevant issue(s) and PR(s) below. If required, add some screenshot(s) to support your changes.

• Relevant Issues : fix Can't list files with chinese characters on windows 10 #316
• Relevant PRs : (none)
• Type of change :
  • New feature
  • Bug fix for existing feature
  • Code quality improvement
  • Addition or Improvement of tests
  • Addition or Improvement of documentation

[codecov-io]

Codecov Report

Merging #319 into master will decrease coverage by 0.11%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
- Coverage   89.24%   89.13%   -0.12%     
==========================================
  Files           8        8              
  Lines         493      497       +4     
==========================================
+ Hits          440      443       +3     
- Misses         53       54       +1

Impacted Files	Coverage Δ
lib/colorls/core.rb	89.95% <80%> (-0.28%)	⬇️

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