Bump coffee-rails from 4.0.1 to 4.2.2

[dependabot-preview]

Bumps coffee-rails from 4.0.1 to 4.2.2.

Changelog

Sourced from coffee-rails's changelog.

4.2.2 (May 24, 2017)

• Support digest resolution for coffee templates.

4.2.1 (June 30, 2016)

• Fix error in the gem package.

4.2.0 (June 30, 2016)

• Override js_template hook in the Rails generator to allow Rails to
  be CoffeeScript agnostic.

4.1.1 (December 18, 2015)

• Allow Rails 5.

  Rafael Mendonça França

4.1.0 (October 12, 2014)

• Default to .coffee extension instead of .js.coffee

  Joshua Peek

• Register coffee extension for rake notes.

  Roberto Miranda

Commits

• db06599 Prepare to 4.2.2 release
• 61dd433 Don't limit the Rails version to < 6
• db1ed75 Merge pull request #90 from junaruga/feature/update-travis
• 536f717 Update .travis.yml
• 1134eec Merge pull request #95 from richseviora/master
• 99b05b4 Merge branch 'master' into master
• 8830566 Fixes Loading Issue
• bf8ca43 Merge pull request #94 from rails/revert-91-master
• a8cf21e Revert "Register ERBTracker as DependencyTracker for .coffee files to support…"
• aa16fcd Merge pull request #91 from richseviora/master
• Additional commits viewable in compare view

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