message: update(pg-ng): export interface Photo
diff: @@ -78,7 +78,7 @@ After taking a photo, it disappears right away. We need to display it within our
  Outside of the `PhotoService` class definition (the very bottom of the file), create a new interface, `Photo`, to hold our photo metadata:
  ```typescript
  -interface Photo {
  +export interface Photo {
  filepath: string;
  webviewPath: string;
  }
  