chore(package): Update dependency unexpected to v11.5.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
unexpected	devDependencies	patch	11.5.0 -> 11.5.1	source

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Release Notes

unexpectedjs/unexpected

### [`v11.5.1`](https://togithub.com/unexpectedjs/unexpected/blob/master/CHANGELOG.md#v1151-2019-05-12) [Compare Source](https://togithub.com/unexpectedjs/unexpected/compare/v11.5.0...v11.5.1) - [#​633](https://togithub.com/unexpectedjs/unexpected/pull/633) Fix compatibility with the esm module loader ([Andreas Lind](mailto:andreaslindpetersen@gmail.com))

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