Error in handling protocol

[Seraphli]

WebSocket-for-Python/ws4py/client/__init__.py

Lines 312 to 316 in 7f43f2a

	elif header == 'sec-websocket-protocol':
	protocols = ','.join(value)
	elif header == 'sec-websocket-extensions':
	extensions = ','.join(value)

The value will be b'chat' if using same handshake information like the one on wiki.
So using join will result in TypeError: sequence item 0: expected str instance, int found.
I notice this code haven't been changed for 5 years. And I try to find an example of cherrypy and ws4py which contain a setting of Sec-WebSocket-Protocol for websocket server. But I can't find any. I also check the handshake information sent by simple example, and it didn't contain a Sec-WebSocket-Protocol header.
A more astonishing thing is there is no test about Sec-WebSocket-Protocol in test_client.py.

[Seraphli]

I think it should be fixed like this

            elif header == b'sec-websocket-protocol':
                protocols.append(value.decode('utf-8'))

            elif header == b'sec-websocket-extensions':
                extensions.append(value.decode('utf-8'))