[wp-trac] [WordPress Trac] #59071: Update README.md

[WordPress Trac]

#59071: Update README.md
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 Reporter:  dantovbein        |       Owner:  desrosj
     Type:  enhancement       |      Status:  reviewing
 Priority:  normal            |   Milestone:  6.4
Component:  Build/Test Tools  |     Version:
 Severity:  trivial           |  Resolution:
 Keywords:  has-patch         |     Focuses:  docs
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Changes (by algorithmsunlocks):

 * Attachment "59071.diff" added.

 Note update to npm 6.x and node 16.x

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Ticket URL: <https://core.trac.wordpress.org/ticket/59071>
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