check external links using a global worker queue

[kevgo]

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When running Text-Runner in parallel over many code bases I want that external links are checked using a worker queue So that Text-Runner does not not overload the operating system with too many network calls and crashes.

• external links are checked in a global worker queue that applies to all Text-Runner instantiations in the current Node instance

[kevgo]

use https://github.com/sindresorhus/p-limit

[kevgo]

or https://github.com/sindresorhus/p-queue