Downgrade Scoverage plugin version
Downgrade Scoverage plugin version

Problem

There is a conflict between scalatest and scoverage with the current
version combination that is causing some of the builds to fail.

Solution

Let's just downgrade scoverage until we get a better solution.

JIRA Issues: CSL-12207

Differential Revision: https://phabricator.twitter.biz/D943932

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