finatra: Update sbt from 0.13.15 to 0.13.16
finatra: Update sbt from 0.13.15 to 0.13.16

Summary:     Problem:

    sbt 0.13.16 was released, but we use sbt 0.13.15 now.

    Solution:

    Update sbt to the latest.

    Result:

    Update is completed.

    Signed-off-by: Jillian Crossley <jillianc@twitter.com>

JIRA Issues: CSL-4976

Differential Revision: https://phabricator.twitter.biz/D77975

twitter/finatra,twitter/finatra,twitter/finatra