Update __init__.py

caltechdata_api/__init__.py

@@ -9,7 +9,7 @@
     caltechdata_unembargo,
     caltechdata_accept,
 )
-from .customize_schema import customize_schema
+from .customize_schema import customize_schema, validate_metadata
 from .get_metadata import get_metadata
 from .download_file import download_file, download_url
 from .utils import humanbytes