Release plan

[lukemelia]

Concurrent with this project becoming part of the adopted-ember-addons org, I've volunteered to help do some of the maintainership. My number one goal is to help the addon catch up to modern Ember APIs so users have an upgrade path when migrating their apps to octane. Here's a proposed roadmap to get us there:

• 5.0.0 - current stable version
• 6.0.0.beta.0 * Released ✅
  • Drop support for Ember older than 3.8 [BREAKING] Update Ember, drops support for Ember older than 3.8 #110 (Update: merged ✅)
  • Add on-keyboard and keyboard-shortcut element modifiers and promote keyboard-press component Add on-keyboard and keyboard-shortcut element modifiers and promote keyboard-press component #111 (Update: merged ✅)
• 6.0.0.beta.1 * Released ✅
  • Fix for Failing test for alt-key combo not working on a Mac #122 (may require breaking change to software keyboard remapping support) (Update: fixed ✅)
  • New API API Design #135 (Update: merged ✅)
  • Deprecate has/trigger responder API API Design #135 (Update: merged ✅)
  • Deprecate on-keyboard, keyboard-shortcut element modifiers and keyboard-press component from 6.0.0-beta.0 in favor on-key helper & modifier API Design #135 (Update: merged ✅)
  • Deprecate the initializer that reopens TextArea and TextField with config-based opt-out (Update: merged ✅)
  • Add non-mixin API recommended for adding keyboard event handling to controllers and routes (help wanted New Non-Mixin API for using in routes and controllers #115) (Update: merged ✅)
  • Deprecate mixin usage (Update: merged ✅)
• 6.0.0 * Released ✅
  • Everything in the beta above
• 6.0.3 * Released ✅
  • Update dependencies for better ecosystem compatibility
• 6.0.4 * Released ✅
  • Deprecate the old propagation model Deprecate and then remove old propagation model #164
• 7.0.0.beta.0 * Released ✅
  • Drop mixins from the codebase
  • Drop deprecated features from 6.0.0-beta.0: keyboard-press, on-keyboard, and keyboard-shortcut
  • Drop old propagation model from the codebase and warn that the configuration can be removed
  • Drop has/trigger responder API
  • Drop the initializer and warn that the configuration can be removed
• 7.0.0 * Released ✅
  • Everything in the beta above
• 7.0.1 * Released ✅
  • Add disableOnInputFields option, which allows to automatically disable keyboard events on all input fields #557 disableOnInputFields option
• 7.0.2
  • Bump ember-source from 3.28.6 to 4.1.0 #558 improved shadow DOM support
• Beyond?

[bertdeblock]

Maybe these can be ditched as well?
https://github.com/adopted-ember-addons/ember-keyboard/blob/master/addon/index.js#L5-L15
They seem to have been present like this for a while, so seems safe to drop these in the next major?