npm / cli / #2265

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fix(update-notifier): parallelize check for updates

This prevents npm from hanging for an update notification if the server
is slow to respond or the cache file is slow to write.

Failure mode is just that we notify more often than needed, which is not
so bad.

PR-URL: https://github.com/npm/cli/pull/3348
Credit: @isaacs
Close: #3348
Reviewed-by: @wraithgar

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