ci: run on more node versions

Author: goto-bus-stop

.travis.yml

@@ -1,6 +1,13 @@
-sudo: false
 language: node_js
 node_js:
-  - "0.10"
+  - "stable"
+  - "10"
+  - "9"
+  - "8"
+  - "6"
+  - "4"
+  - "iojs"
   - "0.12"
-  - node
+  - "0.10"
+matrix:
+  fast_finish: true