fix lint problem
fix lint problem

fullcalendar/fullcalendar,oleg-babintsev/fullcalendar,oleg-babintsev/fullcalendar,fullcalendar/fullcalendar,arshaw/fullcalendar,arshaw/fullcalendar,arshaw/fullcalendar,fullcalendar/fullcalendar,kleisauke/fullcalendar,arshaw/fullcalendar,kleisauke/fullcalendar,fullcalendar/fullcalendar,oleg-babintsev/fullcalendar,kleisauke/fullcalendar,kleisauke/fullcalendar