John Blackbourn 6df4a18fee Build/Test tools: Switch npm dependency caching strategy on Travis CI.
This switches to caching npm's local cache instead of `node_modules` in order to prevent issues caused by modules compiled using a different version of node.

Merges [44993] into the 4.4 branch.

See #46632


git-svn-id: https://develop.svn.wordpress.org/branches/4.4@45001 602fd350-edb4-49c9-b593-d223f7449a82
2019-03-25 00:58:34 +00:00
2019-03-13 01:30:17 +00:00
2019-03-13 01:30:17 +00:00
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