2.0.0-beta.2

Enhancements

• Migrate task lifetimes to @ember/destroyable underneath, rather than
  patching willDestroy (#377).

  Potentially breaking: this drops support for Node 8 and Ember < 3.8 LTS

Bugfixes

• Ensure encapsulated task state can be accessed on the TaskInstance (#381, #383)

  Note: this uses Proxy and WeakMap, which may need to be polyfilled/unavailable on
  older browsers.

• Make sure task/group-level state field is tracked (#382)

Removals

• Drop unused broccoli-file-creator and ember-maybe-import-regenerator
  dependencies.

  Note on ember-maybe-import-regenerator: This was originally added back when
  generator support in browsers was far lower and Babel 5 and 6 were used. The
  addon does nothing for Babel 7, which is used for ember-concurrency these
  days. Tweaking config/targets.js or adding the regenerator Babel plugin to
  your babel config can be done instead if the regenerator runtime is needed
  to transpile generators for older browsers.

Other

• [dev] Upgrade Ember-CLI to 3.22 (#380)