Test on Node maintenance LTSes, active LTS and stable

Author: marco-c

.travis.yml

@@ -15,9 +15,10 @@ env:
     - DISPLAY=$(if [[ $TRAVIS_OS_NAME == "linux" ]]; then echo ':99.0'; fi)
     - MOZ_XVFB=$(if [[ $TRAVIS_OS_NAME == "linux" ]]; then echo 1; fi)
   matrix:
-    - NODE_VERSION="4"
-    - NODE_VERSION="6"
-    - NODE_VERSION="stable"
+    - NODE_VERSION="6"  # Maintenance LTS
+    - NODE_VERSION="8"  # Maintenance LTS
+    - NODE_VERSION="lts/*"
+    - NODE_VERSION="node"
 before_install:
   - rm -rf ~/.nvm
   - git clone https://github.com/creationix/nvm.git ~/.nvm && (cd ~/.nvm && git checkout `git describe --abbrev=0 --tags`)