Update travis.yml: Add node 6 & 7 (#58)

pzrq · web-flow · commit 45caf836d104 · 2017-03-14T14:10:54.000+11:00
Also drops the `lts/boron` alias in favour of the better supported alias `6`.
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,8 @@ language: node_js
 sudo: required
 node_js:
   - 6.3.1
-  - lts/boron
+  - 6
+  - 7
 script: npm run-script ci
 cache:
   directories:
