twitter-server: Fix sbt deprecated warnings
twitter-server: Fix sbt deprecated warnings

Summary: Problem

Some sbt operators are deprecated

Solution

Fix warnings.

Result

No warn (without Build trait deprecation)

Signed-off-by: Moses Nakamura <mnakamura@twitter.com>

Differential Revision: https://phabricator.twitter.biz/D74274

twitter/twitter-server,twitter/twitter-server,twitter/twitter-server