Update .travis.yml

Author: vlad-ignatov

.travis.yml

@@ -1,9 +1,7 @@
 language: node_js
 node_js:
-  - "node" #Specifying node will run using the latest stable Node.js release
-  - 4.1
-  - 4.0
-  - 0.12
+  - "node" # Specifying node will run using the latest stable Node.js release
+  - 6.11.1 # LTS
 before_install:
   - "export DISPLAY=:99.0"
   - "sh -e /etc/init.d/xvfb start"