message: Add missing typeing for isNull and parse methods
diff: @@ -3,7 +3,9 @@ export class Utils<TDate> {
  constructor (options?: { locale: any, moment: any });
  date(value: any): TDate;
  - addDays(value: TDate, count: number): TDate;
  + parse(value: string): TDate | null;
  +
  + isNull(value: TDate): boolean;
  isValid(value: TDate): boolean;
  isEqual(value: TDate, comparing: TDate): boolean;
  isSameDay(value: TDate, comparing: TDate): boolean
  @@ -16,6 +18,7 @@ export class Utils<TDate> {
  isBeforeYear(value: TDate, comparing: TDate): boolean;
  isBefore(value: TDate, comparing: TDate): boolean;
  + addDays(value: TDate, count: number): TDate;
  startOfDay(value: TDate): TDate;
  endOfDay(value: TDate): TDate;
  