Update to node 10 in .travis.yml

greenkeeper[bot] · greenkeeper[bot] · commit 7ab98bdc53f6 · 2018-04-26T15:05:16.000Z
diff --git a/.travis.yml b/.travis.yml
@@ -4,6 +4,7 @@ sudo: required
 node_js:
   - "9"
   - "8"
+  - "10"
 services:
   - mongodb
 before_script:
