Add MOCNumberGenerator to services exports

app/services/__init__.py

@@ -1,4 +1,5 @@
 from app.services.brickset_api import BricksetAPI
 from app.services.file_handler import FileHandler
+from app.services.moc_generator import MOCNumberGenerator
 
-__all__ = ['BricksetAPI', 'FileHandler']
+__all__ = ['BricksetAPI', 'FileHandler', 'MOCNumberGenerator']