Update webpack-stream to version 3.1.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

webpack-stream just published its new version 3.1.0, 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 webpack-stream – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 28 commits .

• 8cc17b4 Release v3.1.0.
• 608ad0b Update changelog
• d2276e9 Fixing standard errors
• da83eea Merge pull request #98 from hi-q/master
• 00737ba fixed semicolon for travis build
• 43ffb33 fixed issue https://github.com/shama/webpack-stream/issues/97
• caef8f0 Release v3.0.1.
• 95fdaf4 Update changelog
• 3db36ae Merge pull request #96 from mattlewis92/mattlewis92-patch-1
• 6169c96 Fix fonts passed through the stream
• 231ecd8 Release v3.0.0.
• 82b4232 Update changelog
• 6dd43b5 Update deps
• d9b1771 Remove special handling of source maps and add docs about handling source maps
• 34e0f81 Update devDeps

There are 28 commits in total. See the full diff.

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