bpo-26103: Fix inspect.isdatadescriptor() and a data descriptor definition. (GH-1959)

Look for '__set__' or '__delete__'.
diff --git a/Misc/ACKS b/Misc/ACKS
index cb7f4cd..4d295b6 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -603,6 +603,7 @@
 Václav Haisman
 Zbigniew Halas
 Walker Hale IV
+Aaron Christopher Hall
 Bob Halley
 Jesse Hallio
 Jun Hamano