Node.js version cleanup

* Remove EOL'd node.js versions

Author: neilsh

.travis.yml

@@ -1,9 +1,7 @@
 sudo: false  # use container-based virtualization environment
 language: node_js
 node_js:
-  - "0.10"
-  - "0.11"
-  - "6"  # most recent Node.js LTS until Oct 2017, https://github.com/nodejs/lts
+  - "6"  # Node.js LTS maintained until April 2019, https://github.com/nodejs/lts
   - "node"  # latest stable Node.js release
 before_script:
   - export DISPLAY=:99.0