package/rng-tools: update help text website reference

We switched to new upstream since commit f9e9c6349afe0
("package/rng-tools: bump to 6.7"). Update the website URL as well.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/rng-tools/Config.in

@@ -9,7 +9,7 @@ config BR2_PACKAGE_RNG_TOOLS
 	help
 	  Daemon to use hardware random number generators.
 
-	  http://sourceforge.net/projects/gkernel/
+	  https://github.com/nhorman/rng-tools
 
 if BR2_PACKAGE_RNG_TOOLS