Fix eslint problem on Travis. (#2744)

lib/timeline/Timeline.js

@@ -581,7 +581,7 @@ Timeline.prototype.toggleRollingMode = function () {
     this.range.stopRolling();
   } else {
     if (this.options.rollingMode == undefined) {
-      this.setOptions(options)
+      this.setOptions(this.options)
     }
     this.range.startRolling();
   }