Object type mismatch

[paulhybryant]

When running the ding-dong-bot, it complains an error about the print statement in the on_scan function.
The given qrcode parameter is not a string, but a ScanStatus.
That print statement needs to be fixed.

[wj-Mcat]

You can refer to: listen event and install latest wechaty package: pip install wechaty==0.7.dev15.

[huan]

@paulhybryant You are running into wechaty/python-wechaty#169 and we have already fixed it.