Summary:
## The dependency [mem](https://github.com/sindresorhus/mem) was updated from `5.1.1` to `6.0.0`.
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.
---
**Publisher:** [sindresorhus](https://www.npmjs.com/~sindresorhus)
**License:** MIT
[Find out more about this release](https://github.com/sindresorhus/mem).
---
<details>
<summary>FAQ and help</summary>
There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).
</details>
---
Your [Greenkeeper](https://greenkeeper.io) bot 🌴
Pull Request resolved: https://github.com/facebook/flipper/pull/635
Reviewed By: jknoxville
Differential Revision: D18449137
Pulled By: passy
fbshipit-source-id: 2ca358574ef710e0113e092d2d887ef2c2ac8047
1cd92e43a5
