Bump mixin-deep from 1.3.1 to 1.3.2 in /examples/draft-0-10-0/playground (facebookarchive#2235)

Summary:
Bumps [mixin-deep](https://github.com/jonschlinkert/mixin-deep) from 1.3.1 to 1.3.2.
<details>
<summary>Commits</summary>

- [`754f0c2`](jonschlinkert/mixin-deep@754f0c2) 1.3.2
- [`90ee1fa`](jonschlinkert/mixin-deep@90ee1fa) ensure keys are valid when mixing in values
- See full diff in [compare view](jonschlinkert/mixin-deep@1.3.1...1.3.2)
</details>
<details>
<summary>Maintainer changes</summary>

This version was pushed to npm by [doowb](https://www.npmjs.com/~doowb), a new releaser for mixin-deep since your current version.
</details>
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</details>
Pull Request resolved: facebookarchive#2235

Reviewed By: elboman

Differential Revision: D18220753

Pulled By: mrkev

fbshipit-source-id: 8fe07baacaa11932c1ffa75dab1121f7974c7f07

Author: dependabot[bot]