Cygwin: Add missing items to release notes

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

winsup/cygwin/release/2.11.0

@@ -20,6 +20,8 @@ What changed:
 
 - Rename the --file option of setfacl(1) to --set-file, as on Linux.
 
+- Support Unicode 10.
+
 
 Bug Fixes
 ---------
@@ -62,3 +64,6 @@ Bug Fixes
 
 - Fix fegetenv behaviour.
   Addresses: https://cygwin.com/ml/cygwin/2018-08/msg00000.html
+
+- Fix NaN handling in strtof/strtod/strtold.
+  Addresses: https://cygwin.com/ml/cygwin/2018-08/msg00150.html

winsup/doc/new-features.xml

@@ -34,6 +34,10 @@ Drop denormal-operand exception from FE_ALL_EXCEPT, as on Linux.
 Rename the --file option of setfacl(1) to --set-file, as on Linux.
 </para></listitem>
 
+<listitem><para>
+Support Unicode 10.
+</para></listitem>
+
 </itemizedlist>
 
 </sect2>