docs: inform users to use Node.js 10 (#926)

Author: daviddias

README.md

@@ -20,8 +20,8 @@
   <a href="https://david-dm.org/ipfs/js-ipfs-http-client"><img src="https://david-dm.org/ipfs/js-ipfs-http-client.svg?style=flat-square" /></a>
   <a href="https://github.com/feross/standard"><img src="https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat-square"></a>
   <a href="https://github.com/RichardLitt/standard-readme"><img src="https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square" /></a>
-  <a href=""><img src="https://img.shields.io/badge/npm-%3E%3D3.0.0-orange.svg?style=flat-square" /></a>
-  <a href=""><img src="https://img.shields.io/badge/Node.js-%3E%3D6.0.0-orange.svg?style=flat-square" /></a>
+  <a href=""><img src="https://img.shields.io/badge/npm-%6E%3D3.0.0-orange.svg?style=flat-square" /></a>
+  <a href=""><img src="https://img.shields.io/badge/Node.js-%3E%3D10.0.0-orange.svg?style=flat-square" /></a>
   <br>
 </p>