trim sensitive info from logs

lib/tasks/say.js

@@ -33,7 +33,7 @@ class TaskSay extends Task {
     const salt = cs.callSid;
     const credentials = cs.getSpeechCredentials(vendor, 'tts');
 
-    this.logger.info({vendor, credentials}, 'Task:say - using vendor');
+    this.logger.info(`Task:say - using vendor: ${vendor}`);
     this.ep = ep;
     try {
       if (!credentials) {