fix added to fix following crash

Fatal Exception: java.lang.IllegalStateException: closed
       at okhttp3.internal.ws.RealWebSocket.sendMessage(RealWebSocket.java:107)
       at io.socket.engineio.client.transports.WebSocket$4.call(WebSocket.java:189)
       at io.socket.engineio.parser.Parser.encodePacket(Parser.java:63)
       at io.socket.engineio.parser.Parser.encodePacket(Parser.java:42)
       at io.socket.engineio.client.transports.WebSocket.write(WebSocket.java:184)
       at io.socket.engineio.client.Transport$3.run(Transport.java:108)
       at io.socket.thread.EventThread.exec(EventThread.java:55)
       at io.socket.engineio.client.Transport.send(Transport.java:103)
       at io.socket.engineio.client.Socket.flush(Socket.java:615)
       at io.socket.engineio.client.Socket.onDrain(Socket.java:606)
       at io.socket.engineio.client.Socket.access$1100(Socket.java:31)
       at io.socket.engineio.client.Socket$6.call(Socket.java:308)
       at io.socket.emitter.Emitter.emit(Emitter.java:117)
       at io.socket.engineio.client.transports.WebSocket$3$1.run(WebSocket.java:171)
       at io.socket.thread.EventThread$2.run(EventThread.java:80)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
       at java.lang.Thread.run(Thread.java:818)

src/main/java/io/socket/engineio/client/transports/WebSocket.java

@@ -190,6 +190,9 @@ public class WebSocket extends Transport {
                         } else if (packet instanceof byte[]) {
                             self.ws.sendMessage(RequestBody.create(BINARY, (byte[]) packet));
                         }
+                    } catch (IllegalStateException e) {
+                        logger.fine("websocket closed before we could write");
+                        doClose();
                     } catch (IOException e) {
                         logger.fine("websocket closed before onclose event");
                         doClose();