Update release date for the package

Change-Id: Ib10615a2f64a52eb0a154e65b2ad29bc19836fbd
Reviewed-on: http://review.couchbase.org/29334
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>