ibm speech fix

lib/tasks/say.js

@@ -137,7 +137,7 @@ class TaskSay extends Task {
     const salt = cs.callSid;
     const credentials = cs.getSpeechCredentials(vendor, 'tts');
 
-    /* parse Nuance voces into name and model */
+    /* parse Nuance voices into name and model */
     let model;
     if (vendor === 'nuance' && voice) {
       const arr = /([A-Za-z-]*)\s+-\s+(enhanced|standard)/.exec(voice);