Update README.md (#426)

* Update README.md

* Update package.json

* Update README.md

* Update package.json

* Update README.md

Author: jmklix

README.md

@@ -59,7 +59,7 @@ be incorporated into a customized agent to meet specific application needs.
 <a name="install"></a>
 ## Installation
 
-**NOTE:** AWS IoT Node.js SDK will only support Node version 4 or above.
+**NOTE:** AWS IoT Node.js SDK will only support Node version 8.17 or above.
 
 You can check your node version by
 

package.json

@@ -10,7 +10,7 @@
   "homepage": "https://github.com/aws/aws-iot-device-sdk-js",
   "main": "index.js",
   "engines": {
-    "node": ">=4.0.0"
+    "node": ">=8.17.0"
   },
   "repository": {
     "type": "git",