Change tested NodeJS versions (#1651)

RunDevelopment · mAAdhaTTah · commit 6ec71e0b75ad · 2019-01-22T07:27:53.000-05:00
Remove Node 4 &amp; 9 because both are EOL'd. Node 10 + current were added.
diff --git a/.travis.yml b/.travis.yml
@@ -1,9 +1,9 @@
 language: node_js
 node_js:
-- '4'
 - '6'
 - '8'
-- '9'
+- '10'
+- 'node'
 # Build all branches
 branches:
   only:
