Update uglify-js to the latest version 🚀

[greenkeeper]

Version 3.1.3 of uglify-js just got published.

Dependency	uglify-js
Current Version	2.7.5
Type	dependency

The version 3.1.3 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.

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Release Notes

v3.1.3

 

Commits

The new version differs by 439 commits.

• 6920e89 v3.1.3
• dd71639 enhance reduce_vars for AST_Accessor (#2339)
• 2dcc552 trap invalid use of reserved words (#2338)
• 55387e8 v3.1.2
• 7e3e9da fix "use asm" numeric output (#2328)
• 00f5094 suppress collapse_vars of this into "use strict" (#2326)
• aceb0af v3.1.1
• 4f0953f handle LHS side-effects on cascade & collapse_vars (#2314)
• 182a47b improve source mapping (#2312)
• cd27f4e v3.1.0
• 8158b1b Testing all leading comments against being PURE comments (#2305)
• aacf3ed extend unsafe on pure global functions (#2303)
• 8b89072 add Date and other known globals to unsafe compress option (#2302)
• 395a17c fix collapse_vars on default function argument (#2299)
• 3f35586 correctly count declarations after hoist_vars (#2297)

There are 250 commits in total.

See the full diff

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