Issue #15001: fix segfault on "del sys.modules['__main__']"

Patch by Victor Stinner.
diff --git a/Misc/NEWS b/Misc/NEWS
index b2ad14b..16ddf41 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -9,6 +9,9 @@
 Core and Builtins
 -----------------
 
+- Issue #15001: fix segfault on "del sys.modules['__main__']". Patch by Victor
+  Stinner.
+
 - Issue #5057: the peepholer no longer optimizes subscription on unicode
   literals (e.g. u'foo'[0]) in order to produce compatible pyc files between
   narrow and wide builds.