• po translations files are now loaded via Webpack. As a result the locales_url
  config option is now removed given that the path to the locale JSON files is now
  determined by the webpack config and can't be changed at runtime.
• The JSON representing emojis is now fetched asynchronously as a separate file converse.emojis.js.
• Webpack is now configured with a publicPath set to /dist/. This is necessary
  so that chunks (such as the emojis and locales JSON files) can be fetched asynchronously.
  This means that all your assets need to be served at /dist. If you need to set a
  different path, you'll need to set publicPath in webpack.config.js to
  your preferred path and then rebuild all assets (e.g. make dist).
• Use listenTo to avoid memory leaks when views get removed.
• SECURITY FIX: Ignore MAM chat messages not sent from yourself
• #1692 Bugfix: TypeError: oldest_message is undefined
• #1704 SECURITY FIX: Impersonation by misusage of groupchat carbons
• #1705 Bugfix: this.roomspanel is undefined after hibernating