msmtp: bump to version 1.4.31

Also added license information

Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/msmtp/msmtp.mk

@@ -4,9 +4,11 @@
 #
 #############################################################
 
-MSMTP_VERSION = 1.4.27
+MSMTP_VERSION = 1.4.31
 MSMTP_SITE = http://downloads.sourceforge.net/project/msmtp/msmtp/$(MSMTP_VERSION)
 MSMTP_SOURCE = msmtp-$(MSMTP_VERSION).tar.bz2
+MSMTP_LICENSE = GPLv3+
+MSMTP_LICENSE_FILES = COPYING
 
 MSMTP_DEPENDENCIES += host-pkgconf