Update dependency sass-loader to ^7.1.0

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
sass-loader	devDependencies	minor	^7.1.0	source

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Release Notes

webpack-contrib/sass-loader

v7.1.0

Compare Source

Features

• Make this package implementation-agnostic (#​573) (bed9fb5), closes #​435

7.0.3 (2018-06-05)

Bug Fixes

• Bare imports not working sometimes (#​579) (c348281), closes #​566

7.0.2 (2018-06-02)

Bug Fixes

• Errors being swallowed when trying to load node-sass (#​576) (6dfb274), closes #​563
• Report error to user for problems loading node-sass (#​562) (2529c07)

7.0.1 (2018-04-13)

Bug Fixes

• Wrong import precedence (#​557) (f4eeff1)

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