Fix gb18030 codec's bug that doesn't map two-byte characters on
GB18030 extension in encoding. (bug reported by Bjorn Stabell)
diff --git a/Misc/NEWS b/Misc/NEWS
index 123e911..30bb985 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -240,6 +240,9 @@
 Library
 -------
 
+- GB18030 codec now can encode additional two-byte characters that
+  are missing in GBK.
+
 - Bug #1704793: Return UTF-16 pair if unicodedata.lookup cannot
   represent the result in a single character.