binary, text are members of stream (API Change):

fix #446

* message_type is removed

Actions Required:

* Change call sites which use message_type with set_option
  to call stream::binary or stream::text instead.

examples/websocket_sync_echo_server.hpp

@@ -215,7 +215,7 @@ private:
                 auto const s = ec.message();
                 break;
             }
-            ws.set_option(beast::websocket::message_type{op});
+            ws.binary(op == beast::websocket::opcode::binary);
             ws.write(b.data(), ec);
             if(ec)
                 break;