Resolve Undefined Symbol in __init__.py

Summary: objects is no longer there and needs to be removed

Reviewed By: liliarizona

Differential Revision: D61603228

fbshipit-source-id: a91985ecfc2587f114f090042f2674eaf08c14f4

facebook_business/__init__.py

@@ -8,8 +8,4 @@
 from facebook_business.api import FacebookAdsApi
 
 __version__ = '20.0.1'
-__all__ = [
-    'session',
-    'objects',
-    'api',
-]
+__all__ = ['session', 'api']