chore(package): update webpack-hot-middleware to version 2.16.0
chore(package): update webpack-hot-middleware to version 2.16.0

https://greenkeeper.io/

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