bump mate-desktop requirement

Author: raveit65

configure.ac

@@ -54,7 +54,7 @@ DBUS_GLIB_REQUIRED_VERSION=0.74
 GLIB_REQUIRED_VERSION=2.50.0
 GIO_REQUIRED_VERSION=2.50.0
 GTK_REQUIRED_VERSION=3.22.0
-MATE_DESKTOP_REQUIRED_VERSION=1.20.0
+MATE_DESKTOP_REQUIRED_VERSION=1.20.2
 LIBMATEKBD_REQUIRED_VERSION=1.17.0
 LIBNOTIFY_REQUIRED_VERSION=0.7.0
 LIBMATEMIXER_REQUIRED_VERSION=1.10.0