docs: def delete_speaker(self, speaker_uri):
          """Delete an speaker from a collection
  
          :param speaker_uri: the URI that references the speaker
          :type speaker_uri: String
  
          :rtype: Boolean
          :returns: True if the speaker was deleted
  
          :raises: APIError if the request was not successful
          """
  
          response = self.api_request(speaker_uri, method='DELETE')
          return self.__check_success(response)