Update dependency file-loader to v4.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
file-loader	dependencies	minor	4.0.0 -> 4.1.0

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Release Notes

webpack-contrib/file-loader

### [`v4.1.0`](https://togithub.com/webpack-contrib/file-loader/blob/master/CHANGELOG.md#​410httpsgithubcomwebpack-contribfile-loadercomparev400v410-2019-07-18) [Compare Source](https://togithub.com/webpack-contrib/file-loader/compare/v4.0.0...v4.1.0) ##### Features - improved validation error messages ([#​339](https://togithub.com/webpack-contrib/file-loader/issues/339)) ([705eed4](https://togithub.com/webpack-contrib/file-loader/commit/705eed4))

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