Update gulp-sass to version 2.1.1 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

gulp-sass just published its new version 2.1.1, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of gulp-sass – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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GitHub Release

Fixes

• Fix sourcemap source appearing as stdin (@joevbruno, #407)

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The new version differs by 6 commits .

• d62227f 2.1.1
• bb90ad7 Merge pull request #407 from joevbruno/filename-patch
• 4e51591 Forgot a comma ...
• 19f54ce changed var srcs to filteredSources + Travis Fix
• 9c042f3 Remove the commented code and l95
• 00963bc Fixed sourcemaps filename issue ('stdin')

See the full diff.

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