chore(deps): update dependency rollup-plugin-url to v2.2.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rollup-plugin-url	devDependencies	patch	2.2.2 -> 2.2.4

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Release Notes

Swatinem/rollup-plugin-url

### [`v2.2.4`](https://togithub.com/Swatinem/rollup-plugin-url/blob/master/CHANGELOG.md#​224--2019-10-08) [Compare Source](https://togithub.com/Swatinem/rollup-plugin-url/compare/v2.2.3...v2.2.4) ================= - fallback to `mkdirp` to keep working on node <= 8 ### [`v2.2.3`](https://togithub.com/Swatinem/rollup-plugin-url/blob/master/CHANGELOG.md#​223--2019-10-08) [Compare Source](https://togithub.com/Swatinem/rollup-plugin-url/compare/v2.2.2...v2.2.3) ================= - remove `mkpath` from dependencies ([#​24](https://togithub.com/rollup/rollup-plugin-url/pull/24)) - update dev dependencies

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