Mention and notify users when creating a status

bookwyrm/activitypub/__init__.py

@@ -3,8 +3,9 @@ import inspect
 import sys
 
 from .base_activity import ActivityEncoder, Image, PublicKey, Signature
+from .base_activity import Link, Mention
 from .note import Note, GeneratedNote, Article, Comment, Review, Quotation
-from .note import Tombstone, Link
+from .note import Tombstone
 from .interaction import Boost, Like
 from .ordered_collection import OrderedCollection, OrderedCollectionPage
 from .person import Person