Update dependency bootstrap-loader to v3

[renovate[bot]]

This Pull Request updates dependency bootstrap-loader from v2.2.0 to v3.0.0

Note: This PR was created on a configured schedule ("before 5am on monday") and will not receive updates outside those times.

Release Notes

### [`v3.0.0`](https://github.com/shakacode/bootstrap-loader/blob/master/CHANGELOG.md#v300---2017-05-11) [Compare Source](https://github.com/shakacode/bootstrap-loader/compare/v3.0.0-beta.1...v3.0.0) ##### Updated - Update to Webpack 4: `extract-text-webpack-plugin` is replaced with `mini-css-extract-plugin`. — Update `basic` & `css-modules` examples. --- ### [`v3.0.0-beta.1`](https://github.com/shakacode/bootstrap-loader/compare/2.2.0...v3.0.0-beta.1) [Compare Source](https://github.com/shakacode/bootstrap-loader/compare/2.2.0...v3.0.0-beta.1) ---

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This PR has been generated by Renovate Bot.