adding profanity_filter support to STT RecognizeStream

Fixes #303

Author: nfriedly

speech-to-text/recognize_stream.js

@@ -25,7 +25,7 @@ var W3CWebSocket = require('websocket').w3cwebsocket;
 
 
 var OPENING_MESSAGE_PARAMS_ALLOWED = ['continuous', 'max_alternatives', 'timestamps', 'word_confidence', 'inactivity_timeout',
-  'content-type', 'interim_results', 'keywords', 'keywords_threshold', 'word_alternatives_threshold', 'smart_formatting' ];
+  'content-type', 'interim_results', 'keywords', 'keywords_threshold', 'word_alternatives_threshold', 'profanity_filter', 'smart_formatting' ];
 
 var QUERY_PARAMS_ALLOWED = ['model', 'X-Watson-Learning-Opt-Out', 'watson-token'];