Move client name into constant
Move client name into constant

goose2460/pusher-websocket-swift,pusher-community/pusher-websocket-swift,pusher/pusher-websocket-swift,pusher/pusher-websocket-swift,impossibleventures/pusher-websocket-swift,pusher/pusher-websocket-swift,goose2460/pusher-websocket-swift,pusher-community/pusher-websocket-swift,impossibleventures/pusher-websocket-swift