Issue #26807: mock_open 'files' no longer error on readline at end of file.

Patch from Yolanda Robla.
diff --git a/Misc/ACKS b/Misc/ACKS
index 2d920db..dda42ca 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1223,6 +1223,7 @@
 Mark Roberts
 Andy Robinson
 Jim Robinson
+Yolanda Robla
 Daniel Rocco
 Mark Roddy
 Kevin Rodgers