transmission: add url in Config.in

[Peter: use homepage rather than trac as pointed out by Yann]
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/transmission/Config.in

@@ -10,6 +10,8 @@ config BR2_PACKAGE_TRANSMISSION
 	help
 	  Transmission is a cross-platform BitTorrent client.
 
+	  http://www.transmissionbt.com/
+
 if BR2_PACKAGE_TRANSMISSION
 
 config BR2_PACKAGE_TRANSMISSION_UTP