Breaking/Upgrade to Ember 4

[ndekeister-us]

⚠️ Breaking, drop support for older versions of Ember and Node <12 ; but allows compatibility for projects using Ember 4

Upgrade to Ember 4

• run run ember-cli-update --to 4.4.0
  • fix some conflicts in README.md (some content has been automatically moved to CONTRIBUTING.md)
  • fix one conflict in tests/dummy/app/templates/application.hbs (text in h tag)
• run npm install to update package-lock.json
• run yarn lint:fix
• fix lint erros

Also fix htmlSafe import, it is now available in @ember/template, importing it from @ember/string will result in this error on production build ->

[ndekeister-us]

With current version app using Ember 4 have an error when rendering code using this addon

ReferenceError: Ember is not defined

(see https://github.com/johno/ember-linkify/blob/master/addon/helpers/linkify.js#L10)

It seems we have this error because we are using in this addon an old version (v6.6) of ember-cli-babel, see warning message from Ember when building the app consuming this addon

Usages of the Ember Global may be caused by an outdated ember-cli-babel dependency. The following steps may help:

* Upgrade the following addons to the latest version:
  * ember-linkify

### Important ###

In order to avoid repeatedly showing the same deprecation messages, no further deprecation messages will be shown for usages of the Ember Global until ember-cli-babel is upgraded to v7.26.6 or above.

To see all instances of this deprecation message, set the `EMBER_GLOBAL_DEPRECATIONS` environment variable to "all", e.g. `EMBER_GLOBAL_DEPRECATIONS=all ember test`.

cc @johno, if you could have a look / publish a release containing the update to Ember 4 🙏

[adong]

@johno Is this still being maintained? Would love to see some ember 4 support. Thank you @ndekeister-us