Update to node 10 in .travis.yml

greenkeeper[bot] · ZeeCoder · commit 7917babc7977 · 2018-05-17T20:50:09.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,8 @@
 language: node_js
 sudo: false
-node_js: [ 6, 7, 8 ]
+node_js:
+- [6,7,8]
+- 10
 after_success: 'yarn run coveralls'
 cache:
     yarn: true
