Update async requirement from ^0.9.0 to ^2.6.3

[dependabot-preview]

Updates the requirements on async to permit the latest version.

Changelog

Sourced from async's changelog.

v2.6.3

• Updated lodash to squelch a security warning (#1675)

v2.6.2

• Updated lodash to squelch a security warning (#1620)

v2.6.1

• Updated lodash to prevent npm audit warnings. (#1532, #1533)
• Made async-es more optimized for webpack users (#1517)
• Fixed a stack overflow with large collections and a synchronous iterator (#1514)
• Various small fixes/chores (#1505, #1511, #1527, #1530)

v2.6.0

• Added missing aliases for many methods. Previously, you could not (e.g.) require('async/find') or use async.anyLimit. (#1483)
• Improved queue performance. (#1448, #1454)
• Add missing sourcemap (#1452, #1453)
• Various doc updates (#1448, #1471, #1483)

v2.5.0

• Added concatLimit, the Limit equivalent of concat (#1426, #1430)
• concat improvements: it now preserves order, handles falsy values and the iteratee callback takes a variable number of arguments (#1437, #1436)
• Fixed an issue in queue where there was a size discrepancy between workersList().length and running() (#1428, #1429)
• Various doc fixes (#1422, #1424)

v2.4.1

• Fixed a bug preventing functions wrapped with timeout() from being re-used. (#1418, #1419)

v2.4.0

• Added tryEach, for running async functions in parallel, where you only expect one to succeed. (#1365, #687)
• Improved performance, most notably in parallel and waterfall (#1395)
• Added queue.remove(), for removing items in a queue (#1397, #1391)
• Fixed using eval, preventing Async from running in pages with Content Security Policy (#1404, #1403)
• Fixed errors thrown in an asyncifyed function's callback being caught by the underlying Promise (#1408)
• Fixed timing of queue.empty() (#1367)
• Various doc fixes (#1314, #1394, #1412)

v2.3.0

• Added support for ES2017 async functions. Wherever you can pass a Node-style/CPS function that uses a callback, you can also pass an async function. Previously, you had to wrap async functions with asyncify. The caveat is that it will only work if async functions are supported natively in your environment, transpiled implementations can't be detected. (#1386, #1390)
• Small doc fix (#1392)

v2.2.0

• Added groupBy, and the Series/Limit equivalents, analogous to _.groupBy (#1364)
• Fixed transform bug when callback was not passed (#1381)
• Added note about reflect to parallel docs (#1385)

v2.1.5

• Fix auto bug when function names collided with Array.prototype (#1358)
• Improve some error messages (#1349)
• Avoid stack overflow case in queue
• Fixed an issue in some, every and find where processing would continue after the result was determined.

... (truncated)

Commits

• f1d8383 Version 2.6.3
• 2b674c1 update changelog
• eab740f fix: udpate lodash. closes #1675
• eaf32be Version 2.6.2
• 684b42e Update built files
• e1bd3da update changelog
• 140a335 fix: update lodash to squelch security warning (#1620)
• 5ed3df1 Version 2.6.1
• e5d7148 Update built files
• 7e84a4f update changelog
• Additional commits viewable in compare view

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[curbengh]

Might be deprecated in favor of native hexojs/hexo#3328

[coveralls]

Coverage remained the same at 97.727% when pulling 5b83e4e on dependabot/npm_and_yarn/async-tw-2.6.3 into 53a7fef on master.