Update gulp-sass to version 2.2.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

gulp-sass just published its new version 2.2.0, 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

Features

• Add error.relativePath (@ajschlosser, #417)
• Preserve the original Node Sass error message in error.messageOriginal (@jlgeering, #420)

Fixes

• Fix readme examples to always return streams (@Keats, #408)

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The new version differs by 15 commits .

• 1888f35 2.2.0
• cc1bca6 Merge pull request #408 from Keats/master
• 52fba69 Merge pull request #420 from jlgeering/error-msg-unformatted
• 847a2d3 Merge pull request #417 from ajschlosser/master
• 3075a84 preserve the original error message
• 5e8af62 add relativePath assertion to sync test
• b3fe81f add relativePath property to error object in order to play nicely with gulp-notify
• d62227f 2.1.1
• 9438bf2 Use new travis infrastructure
• 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
• e4f84b0 Return streams + handle errors everytime in README
• 00963bc Fixed sourcemaps filename issue ('stdin')

See the full diff.

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