Version 3.2.0-beta.6

Changes since 3.1.0-beta.5;

• 💥 [BREAKING] Minimum ember version required bumped to Ember Octane (v3.13)
• 🐞 [BUGFIX] Exclude froala-editor from ember-auto-import
• 🔼 Update ember.js, ember-cli, and froala-editor verions

Reminder; please lock dep versions in at the minor version (ex: "ember-froala-editor": "~3.2.0"), breaking changes come at the minor versions (from upstream froala-editor and needing to keep this addon in-step with the froala-editor versions).

Feedback requested: Considering using ember-auto-import for this addon but doing so would require more involvement from addon users to import all the froala-editor files (editor, plugins, and plugin CSS). Please read through issue #92 and leave feedback there. Thanks!