[gnome-panel] bump libgweather required version

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 0b55292a8e9ee15da60ccc113573ed7fddcdc288
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Sep 9 19:57:39 2018 +0300

    bump libgweather required version

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index e9f3adfc5..c13fbdadc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -121,7 +121,7 @@ LIBECAL_REQUIRED=3.5.3
 LIBEDATASERVER_REQUIRED=3.5.3
 LIBSYSTEMD_REQUIRED=230
 CAIRO_REQUIRED=1.0.0
-GWEATHER_REQUIRED=3.17.1
+GWEATHER_REQUIRED=3.28.0
 DCONF_REQUIRED=0.13.4
 XRANDR_REQUIRED=1.3.0