MAINTAINERS: update Serge Hallyn's email address

Author: Serge Hallyn <serge.hallyn@ubuntu.com>
Date:   Thu May 19 23:37:05 2016 -0500

    Update email address

    My canonical.com email address will soon stop working.
Signed-off-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>

MAINTAINERS

@@ -2813,7 +2813,7 @@ F:	include/uapi/linux/can/error.h
 F:	include/uapi/linux/can/netlink.h
 
 CAPABILITIES
-M:	Serge Hallyn <serge.hallyn@canonical.com>
+M:	Serge Hallyn <serge@hallyn.com>
 L:	linux-security-module@vger.kernel.org
 S:	Supported
 F:	include/linux/capability.h