Added the constants ascii_letters, ascii_lowercase, and ascii_uppercase
to the string module.  This was determined to be the right approach in
SF bug #226706.
diff --git a/Misc/NEWS b/Misc/NEWS
index 55edded..344949c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -149,6 +149,11 @@
 
 Library
 
+- The constants ascii_letters, ascii_lowercase. and ascii_uppercase
+  were added to the string module.  These a locale-indenpendent
+  constants, unlike letters, lowercase, and uppercase.  These are now
+  use in appropriate locations in the standard library.
+
 - The flags used in dlopen calls can now be configured using
   sys.setdlopenflags and queried using sys.getdlopenflags.