rc: add announcement to changelog

CHANGELOG

@@ -27,7 +27,27 @@
     install ECL on the preferred destination (specified with "--prefix"
     parameter given to configure script).
 
-* Pending changes since 16.1.2
+* Pending changes since 16.1.3
+* 16.1.3 changes since 16.1.2
+** Announcement
+Dear Community,
+
+After almost a year of development we are proud to present a new release of
+ECL tagged with version =16.1.3=. All changes are backward compatible
+fixing bugs and other issues, implementing new interfaces and cleaning up
+the code base.
+
+Before this release we have performed extensive tests on various platforms
+(Linux, FreeBSD, OpenBSD, NetBSD, OSX, Windows MSVC, Windows MinGW, Windows
+Cygwin, Android and Haiku). For details regarding the testing please
+consult https://gitlab.com/embeddable-common-lisp/ecl/issues/307. The have
+shown no serious regressions (but revealed various bugs and kludges). Extra
+attention has been paid to Windows testing to improve that platform
+support.
+
+Best regards,
+ECL Development Team
+
 ** API changes
 - Added better interface for package-locks
 Introduced functions:
@@ -84,7 +104,8 @@ in =*features*=
 
 - configure options has been revised.
 
-- ASDF has been upgraded to version 3.1.7.26.
+- ASDF has been upgraded to version 3.1.7.26 (with a few patches scheduled
+  for 3.2.0).
 
 - Bundled CLX has been purged
 Lately I've fixed ECL support on portable CLX maintained by sharplispers on