Update Node.js.

Author: octalmage

.travis.yml

@@ -18,9 +18,12 @@ matrix:
     - php: 5.6
       env: WP_VERSION=latest WP_MULTISITE=1
   allow_failures:
-    - php: 5.2 
-    
+    - php: 5.2
+
 before_script:
+  - curl -o ~/.nvm/nvm.sh https://raw.githubusercontent.com/creationix/nvm/v0.31.0/nvm.sh # update nvm
+  - bash -c "nvm use 8.9.1" || true
+  - bash -c "source ~/.nvm/nvm.sh; nvm install $NODE_JS_VERSION; node --version"
   - composer install
   - npm install
   - bash tests/bin/install-wp-tests.sh wordpress_test root '' localhost $WP_VERSION
@@ -33,6 +36,6 @@ before_script:
     fi
 
 
-script: 
+script:
   - phpunit
   - npm test