Update uglify-js to version 3.0.1 🚀

[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,

uglify-js just published its new version 3.0.1.

State	Update 🚀
Dependency	uglify-js
New version	3.0.1
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 uglify-js.
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

 

---

The new version differs by 371 commits .

• 014f428 v3.0.1
• a3b2eb7 return Error from minify() (#1880)
• da295de support dumping AST (#1879)
• 4f8ca46 deprecate low level API (#1877)
• e547483 support minify() output as AST (#1878)
• 2d99d06 update documentation
• 98cf95e fix test for #1865 (#1873)
• 7313465 v3.0.0
• 2c7ee95 fix unsafe on evaluate of reduce_vars (#1870)
• ecf3563 kill opera (#1869)
• dee5a27 enhance collapse_vars (#1862)
• 5a25d24 rename variables for better readability (#1863)
• bffdc8d update test/benchmark.js resources (#1864)
• 69b5663 restore report of supported options (#1861)
• ea92897 improve literal return optimization (#1860)

There are 250 commits in total. See the full diff.