Update readable-stream to version 2.1.3 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

readable-stream just published its new version 2.1.3, 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 readable-stream – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 96 commits .

• abcff84 2.1.3
• fe2de84 build for v6.1.0 plus fixes for assert and buffer changes
• 06754ee 2.1.2
• 2ffb758 fix browserify build
• c3d049d 2.1.1
• fd20cb5 fixes #205 reuse existing import of "stream"
• 4c2d8e2 2.1.0
• a16228b add passthrough env variable to allow testing of native streams, also adds coverage
• f6ada39 test against microsoft edge (#194)
• 4ddd983 build for 5.9.1
• 01fb560 2.0.6
• 89ccfb2 bump tape version (mainly to get the tests to rerun)
• 7008a78 build for 5.8.0
• 4102464 fix for sync write issues in older node
• c9364ba remove "retain lines"

There are 96 commits in total. See the full diff.

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[hackergrrl]

Maybe someone more familiar with greenkeeper knows if there's some way to tell greenkeeper to not bother us if there's an update outside of our semver range? This doesn't hurt / affect us and produces PR noise for someone to close/merge.

[hackergrrl]

Filed greenkeeperio/greenkeeper#189