Fix for Octane this.$() deprecation

[edprats]

In Ember Octane, new deprecation warnings are shown because this add-on uses jQuery.

Using this.$() in a component has been deprecated, consider using this.element [deprecation id: ember-views.curly-components.jquery-element]

Solution:

1. Import Jquery

// old
import $ from "jquery";

// new
import jQuery from 'jquery';

2. Change invocation

// old
  _setupJsTree() {
    return this.$().jstree(this._buildConfig());
  },

// new
  _setupJsTree() {
    return $(this.element).jstree(this._buildConfig());
  },

thanks!

[tythewebguy]

Looks like ember-cli-jstree is outdated and abandoned.