Websocket subprotocols on Blueprint decorator

[ahopkins]

Subprotocols do not seem to be included on blueprint websockets.

I see this on the Sanic.websocket class, but not on Blueprint.websocket.

Any way we could add that feature?

See #874

[sjsadowski]

@ahopkins #1214

[ahopkins]

Let's leave this one open for now ... but I think there is more discussion to be had that is probably more appropriate under #1214 .

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If this is incorrect, please respond with an update. Thank you for your contributions.

[ahopkins]

Resolved by #2010