make executables bold

[t-mangoe]

Description

I added feature that show executables files using boldface.

• Relevant Issues : Make executables bold #217
• 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 #405 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #405      +/-   ##
==========================================
+ Coverage   88.99%   89.01%   +0.02%     
==========================================
  Files           8        8              
  Lines         518      519       +1     
==========================================
+ Hits          461      462       +1     
  Misses         57       57              

Impacted Files	Coverage Δ
lib/colorls/core.rb	90.30% <100.00%> (+0.04%)	⬆️
lib/colorls/fileinfo.rb	79.48% <100.00%> (ø)

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[avdv]

Sorry for the late response, but I am in vacation currently... and I just wanted to be sure that bright is the thing we want, and it is indeed an alias for bold.

Thank you!