formatting fix

app.py

@@ -59,7 +59,7 @@ def change_model(language, model_name):
 def generate_audio_by_text(text, text_type, speaker):
     output_file_name = "{datetime}.wav".format(datetime=datetime.now().isoformat().replace(':', '-'))
     output = os.path.join("out_audio", output_file_name)
-    
+
     if text_type == 'SSML':
         return model.save_wav(
             audio_path=output,