bpo-38077: IDLE no longer adds 'argv' to the user namespace (GH-15818)

This only happened when initializing the subprocess to run a module.
This recent bug only affected 3.7.4 and 3.8.0b2 to 3.8.0b4.
diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index 559ffd0..3ccc5c0 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -3,6 +3,9 @@
 ======================================
 
 
+bpo-38077: IDLE no longer adds 'argv' to the user namespace when
+initializing it.  This bug only affected 3.7.4 and 3.8.0b2 to 3.8.0b4.
+
 bpo-38401: Shell restart lines now fill the window width, always start
 with '=', and avoid wrapping unnecessarily. The line will still wrap
 if the included file name is long relative to the width.