An in-range update of prop-types is breaking the build 🚨

## The dependency [prop-types](https://github.com/facebook/prop-types) was updated from `15.6.2` to `15.7.0`.

🚨 [View failing branch](https://github.com/jhen0409/react-native-boilerplate/compare/master...jhen0409:greenkeeper%2Fprop-types-15.7.0).

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

prop-types 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 failed ([Details](https://travis-ci.org/jhen0409/react-native-boilerplate/builds/491397870?utm_source=github_status&utm_medium=notification)).

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