Incorrect disconnect code

[alexanderbrus]

Library ws which used under the hood for node.js clients, does not allow disconnect codes 1004, 1005 and 1006.

But anyway socketcluster-client uses 1005 and 1006 which leads to Uncaught exception: "TypeError: First argument must be a valid error code number" (see, WS Code validation)

[jondubois]

@alexanderbrus Which version of socketcluster-client is affected? How to reproduce this issue?