fix(calendar): export CalendarView enum #5895

Author: hanastasov

projects/igniteui-angular/src/lib/calendar/index.ts

@@ -4,5 +4,6 @@ export * from './days-view/days-view.component';
 export * from './months-view/months-view.component';
 export * from './years-view/years-view.component';
 export * from './month-picker/month-picker.component';
+export * from './month-picker-base';
 export * from './calendar.directives';
 export * from './calendar.module';