fix(deps): update dependency postcss-loader to v2.1.5

[renovate[bot]]

This Pull Request updates dependency postcss-loader from v2.1.4 to v2.1.5

Note: This PR was created on a configured schedule ("every weekend" in timezone Europe/Paris) and will not receive updates outside those times.

Release Notes

### [`v2.1.5`](https://github.com/postcss/postcss-loader/blob/master/CHANGELOG.md#​215httpsgithubcompostcsspostcss-loadercomparev214v215-2018-05-04) [Compare Source](https://github.com/postcss/postcss-loader/compare/v2.1.4...v2.1.5) ##### Bug Fixes * **index:** remove `sourceMap` warning ([#​361](`https://github.com/postcss/postcss-loader/issues/361`)) ([4416791](https://github.com/postcss/postcss-loader/commit/4416791)) ---

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This PR has been generated by Renovate Bot.

[algobot]

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