Update to node 10 in .travis.yml

greenkeeper[bot] · greenkeeper[bot] · commit 3f652358964b · 2018-04-26T15:55:20.000Z
diff --git a/.travis.yml b/.travis.yml
@@ -5,6 +5,7 @@ node_js:
 - '6'
 - '5'
 - '4'
+- '10'
 script: npm run test
 before_install: yarn global add greenkeeper-lockfile@1
 before_script: greenkeeper-lockfile-update
