Update node.js version for travis

Author: wwwebman

.travis.yml

@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-    - "8.9.1"
+    - "10.16.0"
 before_script:
     # starting a GUI to run tests, per https://docs.travis-ci.com/user/gui-and-headless-browsers/#Using-xvfb-to-Run-Tests-That-Require-a-GUI
     - export DISPLAY=:99.0