Cygwin: document wctype changes

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/release/2.12.0

@@ -49,6 +49,8 @@ What changed:
 - open(..., O_TMPFILE) now moves the file to the trash bin immediately,
   to free the parent directory.
 
+- Wctype functions updated to Unicode 11.0.
+
 
 Bug Fixes
 ---------
@@ -67,3 +69,6 @@ Bug Fixes
              https://cygwin.com/ml/cygwin/2018-12/msg00028.html
 
 - Fix a bug in select(2) when polling HANDLE-less descriptors.
+
+- Fix WEOF handling in wctype functions.
+  Addresses: https://cygwin.com/ml/cygwin/2018-12/msg00173.html

winsup/doc/new-features.xml

@@ -80,6 +80,10 @@ open(..., O_TMPFILE) now moves the file to the trash bin immediately,
 to free the parent directory.
 </para></listitem>
 
+<listitem><para>
+Wctype functions updated to Unicode 11.0.
+</para></listitem>
+
 </itemizedlist>
 
 </sect2>