add Node.js 10, remove Node.js 4 (#583)

DanielRuf · Qix- · commit 05b0ceb8856b · 2018-06-23T20:31:31.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,9 +3,9 @@ sudo: false
 language: node_js
 
 node_js:
-  - "4"
   - "6"
   - "8"
+  - "10"
 
 install:
   - make install
