Update dependency mini-css-extract-plugin to v0.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
mini-css-extract-plugin	dependencies	minor	0.5.0 -> 0.6.0	source

---

Release Notes

webpack-contrib/mini-css-extract-plugin

### [`v0.6.0`](https://togithub.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md#​060httpsgithubcomwebpack-contribmini-css-extract-plugincomparev050v060-2019-04-10) [Compare Source](https://togithub.com/webpack-contrib/mini-css-extract-plugin/compare/v0.5.0...v0.6.0) ##### Features - added error code to chunk load Error ([#​347](https://togithub.com/webpack-contrib/mini-css-extract-plugin/issues/347)) ([b653641](https://togithub.com/webpack-contrib/mini-css-extract-plugin/commit/b653641)) - adding hot module reloading ([#​334](https://togithub.com/webpack-contrib/mini-css-extract-plugin/issues/334)) ([4ed9c5a](https://togithub.com/webpack-contrib/mini-css-extract-plugin/commit/4ed9c5a)) - publicPath can be a function ([#​373](https://togithub.com/webpack-contrib/mini-css-extract-plugin/issues/373)) ([7b1425a](https://togithub.com/webpack-contrib/mini-css-extract-plugin/commit/7b1425a))

---

Renovate configuration

:date: Schedule: "on tuesday" (UTC).

:vertical_traffic_light: Automerge: Enabled.

:recycle: Rebasing: Whenever PR becomes conflicted, or if you modify the PR title to begin with "rebase!".

:no_bell: Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Renovate Bot. View repository job log here.