Use node 8

mjackson · mjackson · commit b6fe85c511e3 · 2018-01-31T13:41:46.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: node_js
-node_js: node
+node_js: 8
 cache:
   directories:
   - "$HOME/.cache/yarn"
