Issue #15841: The readable(), writable() and seekable() methods of BytesIO
and StringIO objects now raise ValueError when the object has been closed.
Patch by Alessandro Moura.
diff --git a/Misc/ACKS b/Misc/ACKS
index f534143..5df7962 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -658,6 +658,7 @@
 Paul Moore
 Derek Morr
 James A Morrison
+Alessandro Moura
 Pablo Mouzo
 Mher Movsisyan
 Ruslan Mstoi