Update dependency css-loader to v2.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
css-loader	devDependencies	minor	2.0.2 -> 2.1.0	source

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Release Notes

webpack-contrib/css-loader

v2.1.0

Compare Source

Features

• support image-set without url (#​879) (21884e2)

2.0.2 (2018-12-21)

Bug Fixes

• inappropriate modification of animation keywords (#​876) (dfb2f8e)

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[coveralls]

Pull Request Test Coverage Report for Build 597

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 595:	0.0%
Covered Lines:	53
Relevant Lines:	53

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💛 - Coveralls