Downgrade deploy-queue to ECMAScript 5.1
Downgrade deploy-queue to ECMAScript 5.1

Test Plan: Tested with an older Node.

Reviewers: mikelee, csilvers, mroth

Reviewed By: mroth

Subscribers: mroth

Differential Revision: https://phabricator.khanacademy.org/D20288

Khan/culture-cow,Khan/culture-cow