Update node engine version in package.json (#32)

Author: danielcaldas

README.md

@@ -11,11 +11,6 @@
 ## Documentation :book:
 Full documentation [here](https://danielcaldas.github.io/react-d3-graph/docs/index.html).
 
-## Compatibility
-- Node version **6.9.x**
-- React version **15.6.1**
-- d3 version **4.10.2**
-
 ## Install
 [![https://nodei.co/npm/YOUR-MODULE-NAME.png?downloads=true&downloadRank=true&stars=true](https://nodei.co/npm/react-d3-graph.png?downloads=true&downloadRank=true&stars=true)](https://www.npmjs.com/package/react-d3-graph)
 

package.json

@@ -58,7 +58,7 @@
         "webpack-visualizer-plugin": "0.1.11"
     },
     "engines": {
-        "node": "6.9.x"
+        "node": ">=6.9.5"
     },
     "main": "lib/index.js",
     "repository": {