DEVELOPERS: add Alexander Mukhin for package/zfs

Signed-off-by: Alexander Mukhin <alexander.i.mukhin@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 3beef4b0d41ec862fd89745bc9f496247af7bff7)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -114,6 +114,7 @@ F:	package/libest/
 
 N:	Alexander Mukhin <alexander.i.mukhin@gmail.com>
 F:	package/tinyproxy/
+F:	package/zfs/
 
 N:	Alexander Sverdlin <alexander.sverdlin@gmail.com>
 F:	package/mini-snmpd/