Sprockets Deprecation

** [out :: rp] Notice: /Exec[bundle exec rake assets:precompile]/returns: DEPRECATION WARNING: You are using the a deprecated processor interface #.

 ** [out :: rp] Notice: /Exec[bundle exec rake assets:precompile]/returns: Please update your processor interface:

 ** [out :: rp] Notice: /Exec[bundle exec rake assets:precompile]/returns: https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors

 ** [out :: rp] Notice: /Exec[bundle exec rake assets:precompile]/returns:  (called from install at /srv/lafon/shared/bundle/ruby/2.3.0/gems/autoprefixer-rails-6.3.7/lib/autoprefixer-rails/sprockets.rb:37)

 ** [out :: rp] Notice: /Exec[bundle exec rake assets:precompile]/returns: DEPRECATION WARNING: Sprockets method `register_engine` is deprecated.

 ** [out :: rp] Notice: /Exec[bundle exec rake assets:precompile]/returns: Please register a mime type using `register_mime_type` then

 ** [out :: rp] Notice: /Exec[bundle exec rake assets:precompile]/returns: use `register_compressor` or `register_transformer`.

 ** [out :: rp] Notice: /Exec[bundle exec rake assets:precompile]/returns: https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors

 ** [out :: rp] Notice: /Exec[bundle exec rake assets:precompile]/returns:  (called from block (2 levels) in at /srv/lafon/shared/bundle/ruby/

https://github.com/rails/sass-rails/issues/381

1. Add the sass rails gem to the the GemFile
   a) gem 'sass-rails', '~> 5.0', '>= 5.0.6'
2. Run gem install sass-rails on the terminal
   a) gem install sass-rails
3. Run bundle install
   a) bundle install --without production && bundle update