Update node-sass to version 4.0.0 🚀

[greenkeeperio-bot]

Hello lovely humans,

node-sass just published its new version 4.0.0.

State	Update 🚀
Dependency	node-sass
New version	4.0.0
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 node-sass.
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

LibSass 3.4.0

Check out the LibSass release notes for more information.

---

The new version differs by 50 commits .

• d8b6ecd Deploy
• 8b46b39 4.0.0
• c1b05b3 Merge pull request #1800 from sass/feat/libsass-3.4.0.1
• dd946fd Update sourcemap test fixtures to match new LibSass behaviour
• 79e86f3 Tweak spec.js to support :only_on and multiple :todo engines
• 6532189 Bump LibSass to 3.4.0
• 1bb893f 3.13.1
• b527d91 Removed top-level return statement from cli (#1827)
• 4491ab4 Check options to be an object (#1825)
• a7e6bea Bump sass-spec@^3.3.6-5
• dc92c18 Update sourceComments documentation in README.md (#1820)
• 2e7f370 3.13.0
• cb8774f Merge pull request #1806 from sass/feat/console-log
• d83ebc8 Use console for logging instead of npmlog
• 79237e6 3.12.5

There are 50 commits in total. See the full diff.

---

This pull request was created by greenkeeper.io.

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