Update ioredis to version 3.1.1 🚀

[greenkeeperio-bot]

🚨🔥⚠️ Action required: Switch to the new Greenkeeper now! 🚨🔥⚠️
This version of Greenkeper will be shutdown on May 31st.
With Integrations first-class bot support landed on GitHub and we’ve rewritten Greenkeeper to take full advantage of it. Simpler setup, fewer pull-requests, faster than ever.

---

Hello lovely humans,

ioredis just published its new version 3.1.1.

State	Update 🚀
Dependency	ioredis
New version	3.1.1
Type	devDependency

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 ioredis.
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!

🌴

---

GitHub Release

In this version, we add Node.js v8 into our test matrix of Travis CI.

Bug Fixes

• show error name in the error stack for Node.js 8 (a628aa7)

---

The new version differs by 45 commits .

• d287fdc chore(release): 3.1.1
• e9bae69 docs(CHANGELOG): 3.1.1
• a628aa7 fix: show error name the error stack for Node.js 8
• 32a073a test: add test case for Node.js v8
• f6fdc82 chore(release): 3.1.0
• ebf2e25 docs(CHANGELOG): 3.1.0
• 105cae9 docs(API): update API docs
• 83ca9b7 docs(README): update contributors
• 493d095 feat(cluster): add option to control timeout on cluster slots refresh (#475)
• e7b6352 fix: non-owned properties cause empty args for mset & hmset (#469)
• 38db0cc chore(release): 3.0.0
• ddb67fc docs(CHANGELOG): 3.0.0
• b5025eb docs(README): update contributors
• a6060cb feat(pipeline): add #length to get the command count
• a389f3c feat(sentinel): allow connection to IPv6-only sentinels (#463)

There are 45 commits in total. See the full diff.

[coveralls]

Changes Unknown when pulling 7ba1a82 on greenkeeper-ioredis-3.1.1 into ** on master**.