Ember htmlSafe is now part of @ember/template

[kevintraver]

For newer version of Ember, htmlSafe is now part of @ember/template instead of @ember/string

https://github.com/adopted-ember-addons/ember-burger-menu/blob/cc934f00f6e02d4679ada8e0c6404bf84be98f87/addon/utils/css-stringify.js#L2

[rnosek]

Looks like dasherize is still apart of '@ember/string'

import { htmlSafe } from '@ember/template'; import { dasherize } from '@ember/string';