upgrade to nodejs v7.4

eistrati · eistrati · commit 125f43573d1a · 2017-01-14T12:01:11.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,7 @@ language: node_js
 sudo: required
 node_js:
   - '4.3'
-  - '7.3'
+  - '7.4'
 cache:
   edge: true
   directories:
