bump minimum node version requirement

Author: Tony Tian

Diff for: .travis.yml

@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "6.3.0"
+  - "6.11.5"
 cache: yarn
 branches:
   only: [master]

Diff for: README.md

@@ -8,7 +8,7 @@ This repo contains a scaffold to help developers build [apps for Zendesk product
 ## Getting Started
 
 ### Dependencies
-- [Node.js](https://nodejs.org/en/) >= 6.3.x
+- [Node.js](https://nodejs.org/en/) >= 6.11.5
 - [Ruby](https://www.ruby-lang.org/) >= 2.0.x
 
 ### Setup

Diff for: package.json

@@ -10,7 +10,7 @@
   "author": "Zendesk",
   "license": "Apache-2.0",
   "engines": {
-    "node": ">=6.3.0"
+    "node": ">=6.11.5"
   },
   "scripts": {
     "test": "jest",