chore(package): update rimraf to version 2.6.1
chore(package): update rimraf to version 2.6.1

https://greenkeeper.io/

kumar303/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,kumar303/addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend,tsl143/addons-frontend,mozilla/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,tsl143/addons-frontend,tsl143/addons-frontend,tsl143/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend,aviarypl/mozilla-l10n-addons-frontend