fix(core): update

test/test.cronmanager.ts

@@ -0,0 +1,11 @@
+import { tap, expect } from '@pushrocks/tapbundle';
+
+import * as smarttime from '../ts/index';
+
+let testCronManager: smarttime.CronManager;
+
+tap.test('should create a valid instance of cronmanager', async () => {
+  testCronManager = new smarttime.CronManager();
+});
+
+tap.start();