Update dependency serve-favicon to v2.5.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
serve-favicon	dependencies	minor	2.4.5 -> 2.5.0	source

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Release Notes

expressjs/serve-favicon

### [`v2.5.0`](https://togithub.com/expressjs/serve-favicon/blob/master/HISTORY.md#​250--2018-03-29) [Compare Source](https://togithub.com/expressjs/serve-favicon/compare/2.4.5...2.5.0) ================== - Ignore requests without `url` property - deps: ms@2.1.1 - Add `week` - Add `w`

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