Update to node 10 in .travis.yml

greenkeeper[bot] · greenkeeper[bot] · commit 6bb3571060dd · 2018-05-17T14:46:12.000Z
diff --git a/.travis.yml b/.travis.yml
@@ -7,6 +7,7 @@ notifications:
 node_js:
   - '6'
   - '4'
+  - '10'
 
 env:
   global:

-Original file line number
+Diff line change
 node_js:
   - '6'
   - '4'
 +  - '10'
 env:
   global: