docs(websocket): fix readme example (#447)

plugins/websocket/README.md

@@ -51,7 +51,7 @@ fn main() {
 Afterwards all the plugin's APIs are available through the JavaScript guest bindings:
 
 ```javascript
-import { WebSocket } from "tauri-plugin-websocket-api";
+import WebSocket from "tauri-plugin-websocket-api";
 
 const ws = await WebSocket.connect("wss://example.com");