Update `ArcanistCoffeeLintLinter` to be compatible with CoffeeLint v1.4.0.

Summary: CoffeeLint v1.4.0 deprecated the `--checkstyle` flag in favor of `--reporter=checkstyle`.

Test Plan: `arc unit`

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9181