Require Node 8+, also test PHP 7.2 and 7.3

.travis.yml

@@ -2,12 +2,14 @@ language: php
 sudo: false
 dist: trusty
 php:
+  - 7.3
+  - 7.2
   - 7.1
   - nightly
 
 env:
-  - TRAVIS_NODE_VERSION="6"
-  - TRAVIS_NODE_VERSION="7"
+  - TRAVIS_NODE_VERSION="8"
+  - TRAVIS_NODE_VERSION="10"
 
 matrix:
   fast_finish: true

README.md

@@ -24,7 +24,7 @@ Make sure all dependencies have been installed before moving on:
 * [WordPress](https://wordpress.org/) >= 4.7
 * [PHP](https://secure.php.net/manual/en/install.php) >= 7.1.3 (with [`php-mbstring`](https://secure.php.net/manual/en/book.mbstring.php) enabled)
 * [Composer](https://getcomposer.org/download/)
-* [Node.js](http://nodejs.org/) >= 6.9.x
+* [Node.js](http://nodejs.org/) >= 8.0.0
 * [Yarn](https://yarnpkg.com/en/docs/install)
 
 ## Theme installation

package.json

@@ -34,7 +34,7 @@
     "test": "npm run -s lint"
   },
   "engines": {
-    "node": ">= 6.9.4"
+    "node": ">= 8.0.0"
   },
   "devDependencies": {
     "autoprefixer": "~8.2.0",