feat: play verb url support single or array list url (#158)

* feat: update time-series 0.11.12

* feat: support play verb url in plain text or array

* fix: review comment

Co-authored-by: Dave Horton <daveh@beachdognet.com>

lib/tasks/conference.js

@@ -541,6 +541,9 @@ class Conference extends Task {
     }
     this.logger.debug(`Conference:_playHook: executing ${tasks.length} tasks`);
 
+    /* we might have been killed while off fetching waitHook */
+    if (this.killed) return [];
+
     if (tasks.length > 0) {
       this._playSession = new ConfirmCallSession({
         logger: this.logger,