message: fix: created at defaulted in constructor
diff: @@ -29,7 +29,7 @@ export class TimelineItem implements ITimelineItem, FirestoreDataConverter<Timel
  @IsObject()
  private _createdAt: Timestamp;
  - constructor(offerSnapshot: IOffer, requestSnapshot: IRequest, createdAt: Timestamp) {
  + constructor(offerSnapshot: IOffer, requestSnapshot: IRequest, createdAt = Timestamp.now()) {
  this._offerSnapshot = offerSnapshot;
  this._requestSnapshot = requestSnapshot;
  this._createdAt = createdAt;
  