Add type annotation

lovelydinosaur · lovelydinosaur · commit d3de6304e30e · 2019-02-18T10:09:35.000Z
diff --git a/databases/core.py b/databases/core.py
@@ -247,7 +247,7 @@ async def rollback(self) -> None:
 
 
 class _EmptyNetloc(str):
-    def __bool__(self):
+    def __bool__(self) -> bool:
         return True
 
 
