Don't explicitly implement ArcanistPuppetLintLinter::supportsReadDataFromStdin
Summary: false is the default return value for this method.
Test Plan: arc unit
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11314