markdown-link-check
                                
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                        Make Async Map threads number configurable
See https://github.com/tcort/markdown-link-check/blob/master/index.js#L37
Default is 2 but when I tried with a lot more, it makes the link checking very fast for me. Of course it's not suitable for everyone, so we should keep a default to 2, but having it configurable would be helpful for others.