add node 7 from travis

bstavroulakis · bstavroulakis · commit a751beed56b8 · 2018-02-03T02:59:44.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,5 @@
 language: node_js
 node_js:
+  - "7"
   - "8"
 script: npm run test --single-run
