fix(core): update

ts/smarttime.plugins.ts

@@ -6,6 +6,7 @@ import * as smartpromise from '@pushrocks/smartpromise';
 export { lik, smartdelay, smartpromise };
 
 // third parties
+import croner from 'croner';
 import dayjs from 'dayjs';
 
-export { dayjs };
+export { croner, dayjs };