fixed small typescript bug

src/applyWsHandler.ts

@@ -100,7 +100,7 @@ type UWSBuiltInOpts = {
   /** Maximum length of received message. If a client tries to send you a message larger than this, the connection is immediately closed. Defaults to 16 * 1024. */
   maxPayloadLength?: number;
   /** Whether or not we should automatically close the socket when a message is dropped due to backpressure. Defaults to false. */
-  closeOnBackpressureLimit?: number;
+  closeOnBackpressureLimit?: boolean;
   /** Maximum number of minutes a WebSocket may be connected before being closed by the server. 0 disables the feature. */
   maxLifetime?: number;
   /** Maximum amount of seconds that may pass without sending or getting a message. Connection is closed if this timeout passes. Resolution (granularity) for timeouts are typically 4 seconds, rounded to closest.