Commit 51912c659 for woocommerce

commit 51912c659db971dcc1bf4a9a31a33777904ec627
Merge: 6466db823 8e893a16c
Author: Claudio Sanches <contato@claudiosanches.com>
Date:   Thu Oct 15 19:56:55 2020 -0300

    Merge pull request #27982 from rodrigoprimo/update/improve-travis-performance

    Improve Travis build performance by running `npm install` only when needed