Update to node 10 in .travis.yml

greenkeeper[bot] · BarryThePenguin · commit 7ff4e6dc7532 · 2018-08-01T08:38:41.000+10:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,7 @@ language: node_js
 node_js:
 - '4.0'
 - '8.0'
+- '10'
 sudo: false
 after_success:
 - bash <(curl -s https://codecov.io/bash)
