Broken example since 3.3.0

[0x26res]

Hi think this change #2890 has changed how the API works.

It means that this example

perspective/examples/python-tornado-streaming/index.html

Line 32 in cbc9c50

const websocket = await perspective.websocket("ws://localhost:8080/websocket");

doesn't work any more.

As far as I can tell these is no websocket in the client? Or maybe the library isn't imported correctly?