Merge pull request #70 from sudo-suhas/ci_multi_node_ver

Run tests on multiple node versions in travis

Author: tmcgee123

.travis.yml

@@ -1,5 +1,9 @@
 language: node_js
-node_js: "4"
+node_js:
+  - "8"
+  - "7"
+  - "6"
+  - "4"
 sudo: false
 script: "npm run-script coverage"
 after_script: "cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js"