update README.md file

Author: Muhammad-Altabba

README.md

@@ -1,7 +1,7 @@
 # Web3.js Chainlink Plugin
 
 ![ES Version](https://img.shields.io/badge/ES-2020-yellow)
-![Node Version](https://img.shields.io/badge/node-14.x-green)
+![Node Version](https://img.shields.io/badge/node-18.x-green)
 [![NPM Package][npm-image]][npm-url]
 
 This is a [web3.js](https://github.com/web3/web3.js) `4.x` plugin for interacting with Chainlink Ethereum contracts.