added correct ending for more days in month
added correct ending for more days in month

jacobscarter/angular-cron-jobs,cristoferdomingues/angular-cron-jobs,jacobscarter/angular-cron-jobs,RajanRastogi/angular-quartz-cron,viltgroup/angular-cron-jobs,angular-cron-jobs/angular-cron-jobs,angular-cron-jobs/angular-cron-jobs,vascofernandes/angular-cron-jobs,vascofernandes/angular-cron-jobs,viltgroup/angular-cron-jobs,RajanRastogi/angular-quartz-cron,cristoferdomingues/angular-cron-jobs