fix issue header Sec-WebSocket-Protocol was null

[maxinminax]

#68

[coveralls]

Coverage decreased (-27.6%) to 65.134% when pulling b7a4475 on maxinminax:master into cb058cd on HyperCubeProject:master.

[balthazar]

Are you sure changing null to undefined would fix the issue? null is actually what's specified in their README. Would an empty array work? I think it would make more sense

[balthazar]

@bennyn Any thoughts on that?

[bennycode]

I am okay with undefined instead of null because that's like it is recommended by the reconnecting-websocket documentation: https://github.com/pladaria/reconnecting-websocket/tree/v3.2.1#max-retries

I also used the undefined value in my initial PR.

[balthazar]

Alright thanks!