Cygwin: Add console patches to release notes

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

winsup/cygwin/release/3.1.0

@@ -1,6 +1,10 @@
 What's new:
 -----------
 
+- Add 24 bit color support using xterm compatibility mode in Windows 10
+  1703 or later.  Add fake 24 bit color support for legacy console,
+  which uses the nearest color from 16 system colors.
+
 
 What changed:
 -------------
@@ -12,3 +16,8 @@ What changed:
 
 Bug Fixes
 ---------
+
+- Fix select() on console in canonical mode.  Return after one line is
+  completed, instead of when only one key is typed.
+
+- Make console I/O functions thread-safe.

winsup/doc/new-features.xml

@@ -12,6 +12,12 @@
 FIFOs can now be opened multiple times for writing.
 </para></listitem>
 
+<listitem><para>
+Add 24 bit color support using xterm compatibility mode in Windows 10
+1703 or later.  Add fake 24 bit color support for legacy console, which
+uses the nearest color from 16 system colors.
+</para></listitem>
+
 </itemizedlist>
 
 </sect2>