visibleDate bug

<nb-calendar-range id="date-range-label" #dateRangePicker [class.disabled-calendar]="disabled" [(range)]="dateRange" [visibleDate]="dateRange.start || dateRangePickerOptions.visibleDate" (rangeChange)="rangeChange($event)" [format]="config.datePickerFormat" [boundingMonth]="dateRangePickerOptions.boundingMonth" [min]="dateRangePickerOptions.min" [max]="dateRangePickerOptions.max" [filter]="dateRangePickerOptions.filter" [dayCellComponent]="dateRangePickerOptions.dayCellComponent" >

should be visibleDate.currentValue instead this.visibleDate

https://github.com/akveo/nebular/blob/14088dc111197a789e69e8600119b2e8dcd10974/src/framework/theme/components/calendar-kit/components/calendar-day-picker/calendar-day-picker.component.ts#L146