Build: Test on Node 10, stop testing on Node 4 & 9

Node.js 4 & 9 are ending their life, Node.js 10 has just been released.

Closes gh-4057

diff --git a/.travis.yml b/.travis.yml
index 4fa82ae7ac8b92dc0b0d5e78bec0cc16b1d7262e..4de56ec5f8713fcca61c185053a870e3be41f1c6 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,9 @@
 language: node_js
 sudo: false
 node_js:
-- "4"
 - "6"
 - "8"
-- "9"
+- "10"
 addons:
   chrome: stable
 env: