msmtp: add hash for license file

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/msmtp/msmtp.hash

@@ -4,3 +4,6 @@ sha1	f997f40dfb3f882df837cfd9a63bd4d271dcdc41	msmtp-1.6.6.tar.xz
 # Locally calculated after checking signature
 # http://downloads.sourceforge.net/project/msmtp/msmtp/1.6.6/msmtp-1.6.6.tar.xz.sig
 sha256	da15db1f62bd0201fce5310adb89c86188be91cd745b7cb3b62b81a501e7fb5e	msmtp-1.6.6.tar.xz
+
+# Hash for license file:
+sha256	8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903	COPYING