reenable the invalid fd test for fdopen
diff --git a/Misc/NEWS b/Misc/NEWS
index 592e1a5..1eb8559 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@
 Core and Builtins
 -----------------
 
+- Issue #4991: os.fdopen now raises an OSError for invalid file descriptors.
+
 - Issue #4838: When a module is deallocated, free the memory backing the
   optional module state data.