fixed typo

README.md

@@ -96,7 +96,8 @@ def my_start_callback():
 def my_stop_callback():
     print("Recording stopped!")
 
-recorder = AudioToTextRecorder(on_recording_started=my_start_callback, on_recording_finished=my_stop_callback)
+recorder = AudioToTextRecorder(on_recording_started=my_start_callback,
+                               on_recording_finished=my_stop_callback)
 ```
 
 ## Testing the Library