add missing import

tyler-c2s · tyler-c2s · commit b81363552f5d · 2021-02-09T12:27:31.000-05:00
diff --git a/pystac/extensions/view.py b/pystac/extensions/view.py
@@ -1,6 +1,7 @@
 from pystac import Extensions
 from pystac.item import Item
 from pystac.extensions.base import (ItemExtension, ExtensionDefinition, ExtendedObject)
+from typing import Optional
 
 
 class ViewItemExt(ItemExtension):
