Update of websockets API

[maroofi]

Hi,

apparently, in the new version of websockes, "extra_headers" won't work anymore. You can change it to additional_headers to work.

So basically, changing this:

extra_headers={'Authorization': "Token " + config.auth_token}) as ws:

to:

additional_headers={'Authorization': "Token " + config.auth_token}) as ws:

will fix it.

Thanks,