[gnome-panel] bump version to 3.40.0, update NEWS

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 841fe4e32ff97b7725694dc60828048fa187f758
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Mar 25 16:30:58 2021 +0200

    bump version to 3.40.0, update NEWS

 NEWS         | 6 ++++++
 configure.ac | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/NEWS b/NEWS
index 9c998ba6e..60e77f032 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,9 @@
+Version 3.40.0
+==============
+- Fix few memory leaks.
+- Adapt to libgweather API changes.
+- Updated translations.
+
 Version 3.38.0
 ==============
 - Fix ssh/sftp bookmarks in Places menu. (#27)
diff --git a/configure.ac b/configure.ac
index ff83b1dd5..bc05bb7ef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@ dnl Define version info
 dnl **************************************************************************
 
 m4_define([gp_major_version], [3])
-m4_define([gp_minor_version], [38])
+m4_define([gp_minor_version], [40])
 m4_define([gp_micro_version], [0])
 m4_define([gp_version], [gp_major_version.gp_minor_version.gp_micro_version])