Update dev-lib

.travis.yml

@@ -1,14 +1,21 @@
 sudo: false
 
-language:
-  - php
+notifications:
+  email:
+    on_success: never
+    on_failure: change
 
-## Cache composer bits
 cache:
   directories:
+    - node_modules
     - vendor
+    - $HOME/phpunit-bin
     - $HOME/.composer/cache
 
+language:
+  - php
+  - node_js
+
 matrix:
   allow_failures:
     - php: hhvm
@@ -36,6 +43,7 @@ matrix:
     env: WP_VERSION=trunk WP_MULTISITE=0
 
 install:
+  - nvm install 6 && nvm use 6
   - export DEV_LIB_PATH=dev-lib
   - if [ ! -e "$DEV_LIB_PATH" ] && [ -L .travis.yml ]; then export DEV_LIB_PATH=$( dirname $( readlink .travis.yml ) ); fi
   - if [ ! -e "$DEV_LIB_PATH" ]; then git clone https://github.com/xwp/wp-dev-lib.git $DEV_LIB_PATH; fi