Document the fact that '\U' and '\u' escapes are not treated specially in 3.0 (see issue 2541)
diff --git a/Misc/NEWS b/Misc/NEWS
index 5c3b875..10640a1 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -26,6 +26,9 @@
   through as unmodified as possible; as a consequence, the C API
   related to command line arguments was changed to use wchar_t.
 
+- All backslashes in raw strings are interpreted literally.  This means that
+  '\u' and '\U' escapes are not treated specially.
+
 Extension Modules
 -----------------