MAINTAINERS: @mitake as "pkg:*" maintainer

Hitoshi has been involved in all components of etcd.
Thanks for your consistent and great work!

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

MAINTAINERS

@@ -1,8 +1,8 @@
 Anthony Romano <anthony.romano@coreos.com> (@heyitsanthony) pkg:*
 Brandon Philips <brandon.philips@coreos.com> (@philips) pkg:*
 Fanmin Shi <fanmin.shi@coreos.com> (@fanminshi) pkg:*
-Gyu-Ho Lee <gyu_ho.lee@coreos.com> (@gyuho) pkg:*
+Gyuho Lee <gyu_ho.lee@coreos.com> (@gyuho) pkg:*
+Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp> (@mitake) pkg:*
 Xiang Li <xiang.li@coreos.com> (@xiang90) pkg:*
 
 Ben Darnell <ben@cockroachlabs.com> (@bdarnell) pkg:github.com/coreos/etcd/raft
-Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp> (@mitake) pkg:github.com/coreos/etcd/auth