The server now forces Websocket binary protocol

It's relatively arbritrary what this header contains, and we know force
it to binary on the server. That makes the warning about HTTP 400
irrelevant.

README.md

@@ -164,6 +164,3 @@ Websockets
 The MQTT service on mqtt.victronenergy.com is also accessible through websockets, on webmqtt.victronenergy.com,
 port 443. This allows for using MQTT from a web browser, supporting all aforementioned behavior. Note that
 mqtt.victronenergy.com also has port 443 open, but this is not a websocket port.
-
-Should you run into HTTP 400 errors, this is because the client needs to support the base64 or binary 
-protocol. Read [this](http://stackoverflow.com/questions/15962359) for more information.