* Get QR Code of the Room from the room, which can be used as scan and join the room.
* Get QR Code Value of the Room from the room, which can be used as scan and join the room.
* > Tips:
* > Tips:
* This function is depending on the Puppet Implementation, see [puppet-compatible-table](https://github.com/Chatie/wechaty/wiki/Puppet#3-puppet-compatible-table)
* 1. This function is depending on the Puppet Implementation, see [puppet-compatible-table](https://github.com/Chatie/wechaty/wiki/Puppet#3-puppet-compatible-table)
* 2. The return should be the QR Code Data, instead of the QR Code Image. (the data should be less than 8KB. See: https://stackoverflow.com/a/12764370/1123955 )