updated readme.md

Author: tatanus

README.md

@@ -5,3 +5,5 @@
 [![Build Status](https://github.com/tatanus/bash_setup/actions/workflows/main.yml/badge.svg)](https://github.com/tatanus/bash_setup/actions/workflows/main.yml)
 [![Last Commit](https://img.shields.io/github/last-commit/tatanus/bash_setup)](https://github.com/tatanus/bash_setup/commits/main)
 
+![Bash >=4.0](https://img.shields.io/badge/Bash-%3E%3D4.0-4EAA25?logo=gnu-bash&logoColor=white)
+