Upgrade Node.js to version 8 (needed for gulp 4)

ben12 · ben12 · commit bb0147022d87 · 2019-08-21T20:28:30.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: node_js
-node_js: "7"
+node_js: "8"
 
 before_install:
     - stty cols 80
