IBM iam_apikey

Steps to reproduce

1. I would like to use IBM instead of Google. In the word game example, replaced line 43 with response["transcription"] = recognizer.recognize_ibm(audio).

In the documentation: recognizer_instance.recognize_ibm(audio_data: AudioData, username: str, password: str, language: str = "en-US", show_all: bool = False) -> Union[str, Dict[str, Any]]

IBM moved to IAM_APIKEY, away from username / password

2. Code from word guess game example:

   set up the response object

   response = {
   "success": True,
   "error": None,
   "transcription": None
   }

   try recognizing the speech in the recording

   if a RequestError or UnknownValueError exception is caught,

   update the response object accordingly

   try:
   #PH: replacing with IBM response["transcription"] = recognizer.recognize_google(audio)
   response["transcription"] = recognizer.recognize_ibm(audio, iam_apikey='*********',
   url='https://stream.watsonplatform.net/speech-to-text/api')

Expected behaviour

Would like to leverage IBM since it provides intermediate results, much faster as Google

Actual behaviour

Error:
Traceback (most recent call last):
File "wordGuess.py", line 92, in
guess = recognize_speech_from_mic(recognizer, microphone)
File "wordGuess.py", line 45, in recognize_speech_from_mic
url='https://stream.watsonplatform.net/speech-to-text/api')
TypeError: recognize_ibm() got an unexpected keyword argument 'iam_apikey'
(What happened instead? How is it different from what you expected?)

(If the library threw an exception, paste the full stack trace here)

System information

(Delete all the statements that don't apply.)

My system is macOS Mojave
My Python version is 3.7.2
My Pip version is 19.0.3
My SpeechRecognition library version is 3.8.1
My PyAudio library version is 0.2.11
My microphones are: MacBook Pro Microphone', 'MacBook Pro Speakers', 'Soundflower (2ch)', 'Soundflower (16ch)']

Start by inspecting the recognize_ibm signature and its documentation, then reproduce the reported TypeError with the word game example in the issue. Done means IBM authentication using iam_apikey is supported or the documented authentication parameters match the current IBM API.