Ember 2.12 deprecation warning

[no-mercy]

Ember will stop passing arguments to component lifecycle hooks. Please change <app@component:trumbowyg-editor::ember1196>#didUpdateAttrs to stop taking arguments.

Trouble is in didUpdateAttrs method, which should be aligned with new requirements:
https://emberjs.com/deprecations/v2.x/#toc_arguments-in-component-lifecycle-hooks

[bradleypriest]

Suggested fix here #4