Update coffee-rails requirement from ~> 4.2.2 to ~> 5.0.0

[dependabot-preview]

Updates the requirements on coffee-rails to permit the latest version.

Changelog

Sourced from coffee-rails's changelog.

5.0.0 (Apr 23, 2019)

• Remove support to Rails < 5.2.
• Support Rails 6.

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

4.0.1 (October 17, 2013)

• Drop support to Rails 4.0.0.rc releases

  Rafael Mendonça França

4.0.0 (April 18, 2013)

• Bump railties version to 4.0.0.beta.

  José Valim

3.2.2 (January 26, 2012)

... (truncated)

Commits

• 32a2939 Prepare to 5.0.0
• 6507f0a Set the javascripts generator option as true in the railtie
• 5f0e005 Point to rails repository
• 74214e8 Merge pull request #114 from larouxn/rails_6_support
• eff9c00 Revert folder structure changes, remove --javascripts flag
• e7ce694 Fix for exclusively Rails 6
• 69e6782 TESTING, use my fork of Rails
• fc8c48c Conditionally use Rails 6 folder stucture
• 5df5816 Merge pull request #111 from larouxn/stop_testing_below_ruby_2.2
• 9bead93 Merge pull request #112 from larouxn/update_travis_jruby_version
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot ignore this [patch|minor|major] version will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.