Upgrade async to version 2.6.1

[depfu]

We've upgraded a dependency and all tests pass. \o/

name	version specification	new version
async	1.4.0	2.6.1

You should probably take a good look at this before merging this pull request, of course.

What changed?

✳️ async ( → 2.6.1) · Repo · Changelog

Commits

See the full diff on Github. The new version differs by 17 commits:

• Version 2.6.1
• Update built files
• update changelog
• update deps per npm audit
• Merge pull request #1533 from chrisdukakis/update-lodash
• update lodash-es to match lodash@4.17
• update lodash in deps & dev deps
• Add node 10 to the tests matrix (#1530)
• Merge pull request #1527 from Qw-in/patch-1
• Typo in makefile
• Optimize the library for webpack users (#1517)
• Merge pull request #1514 from smbape/master
• rename 'forEachOfLimit 1024 * 1024 synchronous call' to 'forEachOfLimit no call stack size exceed error'
• fix "RangeError: Maximum call stack size exceeded"
• Fix typo (#1511)
• Update license year range to 2018
• Added all the function which got changed (#1505)

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