chore(node): add node version info

Author: evenchange4

CHANGELOG.md

@@ -3,6 +3,8 @@
 ## [HEAD]
 > Unreleased
 
+* chore(node): add node version info
+
 ## [v1.2.0]
 > Aug 10, 2017
 

README.md

@@ -4,6 +4,7 @@
 [![Travis][travis-badge]][travis]
 [![Codecov Status][codecov-badge]][codecov]
 [![Github Tag][githubTag-badge]][githubTag]
+[![node][node]]()
 
 [![Dependency Status][dependency-badge]][dependency]
 [![devDependency Status][devDependency-badge]][devDependency]
@@ -176,6 +177,7 @@ MIT: [http://michaelhsu.mit-license.org](http://michaelhsu.mit-license.org)
 [travis]: https://travis-ci.org/evenchange4/micro-medium-api
 [codecov-badge]: https://img.shields.io/codecov/c/github/evenchange4/micro-medium-api.svg?style=flat-square
 [codecov]: https://codecov.io/github/evenchange4/micro-medium-api?branch=master
+[node]: https://img.shields.io/node/v/micro-medium-api.svg
 [npm-badge]: https://img.shields.io/npm/v/micro-medium-api.svg?style=flat-square
 [npm]: https://www.npmjs.com/package/micro-medium-api
 [npm-downloads]: https://img.shields.io/npm/dt/micro-medium-api.svg?style=flat-square

package.json

@@ -15,6 +15,10 @@
     "src",
     "bin"
   ],
+  "engineStrict": true,
+  "engines": {
+    "node": ">=8.0.0"
+  },
   "scripts": {
     "start": "micro src/index.js",
     "dev": "micro-dev src/index.js",