bugfix: aws property is engine not platform

lib/tasks/say.js

@@ -1,5 +1,6 @@
 const Task = require('./task');
 const {TaskName, TaskPreconditions} = require('../utils/constants');
+const { logger } = require('../../app');
 
 class TaskSay extends Task {
   constructor(logger, opts, parentTask) {
@@ -25,7 +26,7 @@ class TaskSay extends Task {
     const vendor = hasVerbLevelTts ? this.synthesizer.vendor : cs.speechSynthesisVendor ;
     const language = hasVerbLevelTts ? this.synthesizer.language : cs.speechSynthesisLanguage ;
     const voice = hasVerbLevelTts ? this.synthesizer.voice : cs.speechSynthesisVoice ;
-    const platform = this.synthesizer.platform || 'standard';
+    const engine = this.synthesizer.engine || 'standard';
     const salt = cs.callSid;
     const credentials = cs.getSpeechCredentials(vendor, 'tts');
 
@@ -48,7 +49,7 @@ class TaskSay extends Task {
           vendor,
           language,
           voice,
-          platform,
+          engine,
           salt,
           credentials
         }).catch((err) => {

lib/tasks/specs.json

@@ -369,7 +369,7 @@
       },
       "language": "string",
       "voice": "string",
-      "platform": {
+      "engine": {
         "type": "string",
         "enum": ["standard", "neural"]
       },