updating travis.yml to use node 8

Igor Canedo · Igor Canedo · commit d03ed7810645 · 2018-05-17T14:25:11.000-03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,7 @@
 language: node_js
 node_js:
   - "node"
+  - "8"
 before_script:
   - "cd sample && npm install && npm run sync-lib && cd ../"
 script: npm run test-coveralls
