Update README.md

Author: weikx

README.md

@@ -70,7 +70,7 @@ Performing a `GET` request:
 ```dart
 Response response;
 Dio dio = new Dio();
-response = await dio.get("/test?id=12&name=wendu")
+response = await dio.get("/test?id=12&name=wendu");
 print(response.data.toString());
 // Optionally the request above could also be done as
 response = await dio.get("/test", queryParameters: {"id": 12, "name": "wendu"});