Update ember-burger-menu to the latest version 🚀

[greenkeeper]

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The devDependency ember-burger-menu was updated from 3.3.3 to 3.3.4.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Publisher: offirgolan
License: MIT

Find out more about this release.

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[frontsidejack]

A preview package of this pull request has been published with the tag greenkeeper_ember-burger-menu-3.3.4.
You can try it out by running the following command:

$ npm install @microstates/ember@greenkeeper_ember-burger-menu-3.3.4

or by updating your package.json to:

{
  "@microstates/ember": "greenkeeper_ember-burger-menu-3.3.4"
}

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