Set node version to 8 due to Gulp 3 issue in v12

niftylettuce · web-flow · commit 1d0e809f5094 · 2019-09-13T10:31:13.000-05:00
Ref: https://stackoverflow.com/a/55926692
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 sudo: required
 dist: xenial
-node_js: stable
+node_js: 8
 addons:
   sauce_connect: true
   firefox: latest
