tests: run tests on all Node.js versions

diff --git a/.travis.yml b/.travis.yml
index f4bf33271c8c4e9950b19ba7c8acc57f659b190e..67654be3c0964f9fd4c4a8626e5c3389a0448575 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,11 @@
 language: node_js
 node_js:
+  - "4"
+  - "5"
   - "6"
+  - "7"
+  - "8"
+  - "9"
 install:
   - npm install -g bower browserstack-runner
   - npm install