docs: update node.js minimal version in README file

Author: ixartz

README.md

@@ -54,7 +54,7 @@ Build your SaaS product faster with [Node.js SaaS Boilerplate](https://modernmer
 Find more [Nextjs Templates](https://creativedesignsguru.com/category/nextjs/).
 ### Requirements
 
-- Node.js 14+ and npm
+- Node.js 16+ and npm
 
 ### Getting started