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
diff --git a/Misc/NEWS b/Misc/NEWS
index e248275..73c32e9 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -124,6 +124,9 @@
 - Issue #22274: In the subprocess module, allow stderr to be redirected to
   stdout even when stdout is not redirected.  Patch by Akira Li.
 
+- Issue #26807: mock_open 'files' no longer error on readline at end of file.
+  Patch from Yolanda Robla.
+
 - Issue #25745: Fixed leaking a userptr in curses panel destructor.
 
 - Issue #26977: Removed unnecessary, and ignored, call to sum of squares helper