When jumping between branches, it would be nice to have the correct node version for the older versions of WordPress. Let's add .nvmrc files to these older branches for the supported versions.
Merges [46295] to the 4.7 branch.
Fixes#48140
git-svn-id: https://develop.svn.wordpress.org/branches/4.7@46297 602fd350-edb4-49c9-b593-d223f7449a82
