chore(package): Update dependency unexpected to v11.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
unexpected	devDependencies	minor	11.3.0 -> 11.4.0	source

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Release Notes

unexpectedjs/unexpected

### [`v11.4.0`](https://togithub.com/unexpectedjs/unexpected/blob/master/CHANGELOG.md#v1140-2019-04-25) [Compare Source](https://togithub.com/unexpectedjs/unexpected/compare/v11.3.0...v11.4.0) - [#​625](https://togithub.com/unexpectedjs/unexpected/pull/625) Do not highlight "trailing" whitespace in diff chunks that aren't the end of the line ([Andreas Lind](mailto:andreaslindpetersen@gmail.com)) - [#​610](https://togithub.com/unexpectedjs/unexpected/pull/610) exportStyle: Pass on the allowRedefinition parameter to the parent's addStyle ([Andreas Lind](mailto:andreaslindpetersen@gmail.com))

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