Cygwin: Add release info for 3.0.7

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
(cherry picked from commit 01c253a4c5)

winsup/cygwin/release/3.0.7

@@ -0,0 +1,16 @@
+What's new:
+-----------
+
+
+What changed:
+-------------
+
+- Updated era and message locale data, in particular add era data for
+  the new Tennō.
+
+
+Bug Fixes
+---------
+
+- Fix WinSock error mapping to POSIX error codes.
+  Addresses: https://cygwin.com/ml/cygwin/2019-04/msg00160.html

winsup/doc/new-features.xml

@@ -31,6 +31,11 @@ third parameter, follow it after returning from the handler.
 
 <itemizedlist mark="bullet">
 
+<listitem><para>
+Updated era and message locale data, in particular add era data for
+the new Tennō.
+</para></listitem>
+
 <listitem><para>
 Support for CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE,
 CLOCK_MONOTONIC_RAW, CLOCK_BOOTTIME, CLOCK_REALTIME_ALARM,