GitHub URI Freezer
Getting GitHub permanent links to files
Usage
Require Ruby 2.6 or later
$ gem install github-urifreezer
$ ghuf.rb 'https://github.com/rails/rails/blob/v5.2.6/activesupport/lib/active_support.rb#L33'
https://github.com/rails/rails/blob/48661542a2607d55f436438fe21001d262e61fec/activesupport/lib/active_support.rb#L33