fix(core): update

ts/index.ts

@@ -1,5 +1,6 @@
 import * as plugins from './smarttime.plugins';
 
+export * from './smarttime.classes.cronmanager';
 export * from './smarttime.classes.date';
 export * from './smarttime.classes.hrtmeasurement';
 export * from './smarttime.classes.timer';

ts/smarttime.classes.cronmanager.ts

@@ -0,0 +1,3 @@
+import * as plugins from './smarttime.plugins';
+
+export class CronManager {}

ts/smarttime.classes.timestamp.ts

@@ -65,6 +65,11 @@ export class TimeStamp {
     }
   }
 
+  /**
+   * returns a boolean for wether a timestamp is younger
+   * @param TimeStampArg
+   * @param tresholdTimeArg
+   */
   public isYoungerThanOtherTimeStamp(TimeStampArg: TimeStamp, tresholdTimeArg: number = 0) {
     if (this.milliSeconds > TimeStampArg.milliSeconds + tresholdTimeArg) {
       return true;

ts/smarttime.plugins.ts

@@ -5,5 +5,6 @@ export { smartpromise };
 
 // third parties
 import * as luxon from 'luxon';
+import * as cron from 'cron';
 
-export { luxon };
+export { luxon, cron };