Test against multiple Node versions on Travis

.travis.yml

@@ -24,6 +24,15 @@ matrix:
   include:
     - env:
       - USE_SAUCE=false
+      - NODE_VERSION="4.8.6"
+      - TEST_COMMAND="bash travis-node-script.sh"
+    - env:
+      - USE_SAUCE=false
+      - NODE_VERSION="8.9.1"
+      - TEST_COMMAND="bash travis-node-script.sh"
+    - env:
+      - USE_SAUCE=false
+      - NODE_VERSION="9.1.0"
       - TEST_COMMAND="bash travis-node-script.sh"
     - env:
       - JASMINE_BROWSER="safari"

travis-node-script.sh

@@ -4,7 +4,7 @@ rm -rf ~/.nvm
 git clone https://github.com/creationix/nvm.git ~/.nvm
 (cd ~/.nvm && git checkout `git describe --abbrev=0 --tags`)
 source ~/.nvm/nvm.sh
-nvm install v4.8.6
+nvm install $NODE_VERSION
 
 npm install
 npm test