fix(package): update clean-css-cli to version 4.0.5
fix(package): update clean-css-cli to version 4.0.5

Closes #4618

https://greenkeeper.io/

atiqueahmedziad/addons-server,kumar303/addons-server,mozilla/addons-server,kumar303/addons-server,mozilla/addons-server,harry-7/addons-server,aviarypl/mozilla-l10n-addons-server,atiqueahmedziad/addons-server,mozilla/addons-server,harikishen/addons-server,diox/olympia,mozilla/olympia,bqbn/addons-server,mozilla/olympia,diox/olympia,mozilla/olympia,wagnerand/olympia,wagnerand/addons-server,kumar303/addons-server,eviljeff/olympia,harry-7/addons-server,psiinon/addons-server,psiinon/addons-server,tsl143/addons-server,aviarypl/mozilla-l10n-addons-server,bqbn/addons-server,atiqueahmedziad/addons-server,diox/olympia,tsl143/addons-server,lavish205/olympia,kumar303/olympia,wagnerand/addons-server,mozilla/addons-server,wagnerand/olympia,harikishen/addons-server,harikishen/addons-server,aviarypl/mozilla-l10n-addons-server,wagnerand/olympia,bqbn/addons-server,psiinon/addons-server,atiqueahmedziad/addons-server,wagnerand/addons-server,lavish205/olympia,diox/olympia,harry-7/addons-server,psiinon/addons-server,eviljeff/olympia,eviljeff/olympia,harry-7/addons-server,mozilla/olympia,aviarypl/mozilla-l10n-addons-server,kumar303/olympia,bqbn/addons-server,wagnerand/olympia,kumar303/olympia,lavish205/olympia,kumar303/olympia,wagnerand/addons-server,harikishen/addons-server,tsl143/addons-server,tsl143/addons-server,eviljeff/olympia,kumar303/addons-server,lavish205/olympia