Update readable-stream to version 2.1.5 🚀

[greenkeeperio-bot]

Hello lovely humans,

readable-stream just published its new version 2.1.5.

State	Update 🚀
Dependency	readable-stream
New version	2.1.5
Type	dependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of readable-stream.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Do you have any ideas how I could improve these pull requests? Did I report anything you think isn’t right?
Are you unsure about how things are supposed to work?

There is a collection of frequently asked questions and while I’m just a bot, there is a group of people who are happy to teach me new things. Let them know.

Good luck with your project ✨

You rock!

🌴

---

The new version differs by 106 commits .

• 758c8b3 2.1.5
• 7ca6e8e fix tests more
• 25ec4c4 fix prepend
• e8ee016 bufferlist
• d22eb88 first stab at 6.3.1
• ad2d515 6.2.1 (#218)
• ec0c642 re-enable iThing tests and update zuul
• 7752832 2.1.4
• e9589f0 try ngrok
• 1227f62 update npm ignore
• 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

There are 106 commits in total. See the full diff.

---

This pull request was created by greenkeeper.io.

_{Tired of seeing this sponsor message? ⚡ greenkeeper upgrade}