Update README.md

Author: ysong10

README.md

@@ -89,7 +89,7 @@ We are more than happy to receive your contributions (any kind of contributions)
 
 First, fork the repository and make sure you:
  - use **java 8**
- - install **nodejs-v8.3.x**. and npm to compile/install dependencies
+ - install **nodejs-v14.21.3**. and npm to compile/install dependencies
  - create and register a Github App of your own and install it in your repositories
 
 After cloning the forked repo, create a .env file in the src folder and set the right environment variables as described  <a href="https://developer.github.com/apps/building-github-apps/">here</a>. This is the format of the file: