drop support for node 4, add support for node 8

Node 4.x went into maintenance on 2017-04-01 and the maintenance end is scheduled on April 2018, which is in one month. https://en.wikipedia.org/wiki/Node.js#Releases
davglass · Mar 19, 2018 · 8f59c3b · 8f59c3b
1 parent cd5fdd8
commit 8f59c3b
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,4 @@
 language: node_js
 node_js:
-    - "4"
     - "6"
+    - "8"