use the most recent version of seriesly client

Change-Id: I4a2d5f12f5b2f47f5cc6320aa41f8de759b3d08c
Reviewed-on: http://review.couchbase.org/25069
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>