Release 0.14.0

[tricknotes]

Summary

Release 0.14.0, carrying the changes merged since 0.13.2:

• Add the package_manager option to install an application's NodeJS dependencies with pnpm (package_manager: :pnpm), yarn, or npm. pnpm_path implies pnpm the way yarn_path implies yarn. The package manager is read through the new EmberCli::App#package_manager and EmberCli::App#pnpm? (Add a package_manager option with pnpm support #676)
• Deprecate yarn: true in favour of package_manager: :yarn. The shorthand still selects yarn, with a deprecation warning, and will be removed in 1.0 (Add a package_manager option with pnpm support #676)
• Identify a project with a pnpm application to Heroku's NodeJS buildpack from rails generate ember:heroku, with a root-level pnpm-lock.yaml, and pin the package manager version in the generated package.json from the packageManager the Ember applications declare, read through the new EmberCli::App#package_manager_spec (Add a package_manager option with pnpm support #676)
• Stop adding rails_12factor to the Gemfile from rails generate ember:heroku. Rails serves the twelve-factor behaviour the gem backported natively since 5.0, and every Rails version this gem supports is >= 5.2. To upgrade, remove rails_12factor from your project's Gemfile (Stop injecting rails_12factor from the Heroku generator #672)
• Replace EmberCli::App#yarn_enabled? with EmberCli::App#yarn? (Detect Yarn the same way the installer does #673)
• Pin the NodeJS version in the package.json that rails generate ember:heroku writes, from the engines.node the Ember applications declare, read through the new EmberCli::App#node_engine. Applications that declare different versions are left unpinned (Pin the Heroku build's NodeJS version to what the app requires #674)

Bumps EmberCli::VERSION from 0.13.2 to 0.14.0 and retitles the unreleased CHANGELOG section accordingly. A minor bump rather than a patch: the release adds an option, deprecates one, renames App#yarn_enabled?, and changes what the Heroku generator writes.

After merging

Per RELEASING.md: tag v0.14.0 on the merge, push the tag, then gem build ember-cli-rails.gemspec && gem push ember-cli-rails-0.14.0.gem.

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