OpenInterest imports for cryptofeed

piker/brokers/deribit/api.py

@@ -52,12 +52,14 @@ from cryptofeed import FeedHandler
 from cryptofeed.defines import (
     DERIBIT,
     L1_BOOK, TRADES,
-    OPTION, CALL, PUT
+    OPTION, CALL, PUT,
+    OPEN_INTEREST,
 )
 from cryptofeed.symbols import Symbol
 from cryptofeed.types import (
     L1Book,
     Trade,
+    OpenInterest,
 )
 from piker.brokers import SymbolNotFound
 from .venues import (