Update README.md

README.md

@@ -121,7 +121,7 @@ paddlespeech st --input ./test_audio.wav
 ```
 **Text-to-Speech** 
 ```shell
-paddlespeech tts --lang zh --input ./test_text.txt 
+paddlespeech tts --input "你好，欢迎使用百度飞桨深度学习框架！"
 ```
 
 If you want to try more functions like training and tuning, please see [Speech-to-Text Quick Start](./docs/source/asr/quick_start.md) and [Text-to-Speech Quick Start](./docs/source/tts/quick_start.md).