Bump version number to v7.0.4
Bump version number to v7.0.4

Change-Id: I23d76407ec2a04dafa0ae5c97bc07a63e31a9a73
Reviewed-on: http://review.couchbase.org/83581
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

brett19/gocbcore