An in-range update of fastboot is breaking the build 🚨

## The dependency [fastboot](https://github.com/ember-fastboot/fastboot) was updated from `1.2.0` to `1.2.1`.

🚨 [View failing branch](https://github.com/ember-fastboot/ember-cli-fastboot/compare/master...ember-fastboot:greenkeeper%2Ffastboot-1.2.1).

This version is **covered** by your **current version range** and after updating it in your project **the build failed**.

fastboot is a direct dependency of this project, and **it is very likely causing it to break**. If other packages depend on yours, this update is probably also breaking those in turn.

Status Details

- ❌ **continuous-integration/travis-ci/push:** The Travis CI build is in progress ([Details](https://travis-ci.org/ember-fastboot/ember-cli-fastboot/builds/429657838?utm_source=github_status&utm_medium=notification)).
- ❌ **continuous-integration/appveyor/branch:** AppVeyor build failed ([Details](https://ci.appveyor.com/project/embercli/ember-cli-fastboot/build/559)).

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Your [Greenkeeper](https://greenkeeper.io) Bot :palm_tree: