fix: createConnection() via public API (#384)

Fixes https://github.com/microsoft/playwright-mcp/issues/382

README.md

@@ -231,7 +231,7 @@ http.createServer(async (req, res) => {
   // ...
 
   // Creates a headless Playwright MCP server with SSE transport
-  const connection = await createConnection({ headless: true });
+  const connection = await createConnection({ browser: { launchOptions: { headless: true } } });
   const transport = new SSEServerTransport('/messages', res);
   await connection.connect(transport);