Update README.md

Author: phamquiluan

README.md

@@ -71,15 +71,13 @@ python3.12 -m venv env
 Install RCAEval using pip
 
 ```bash
-pip install pip==20.0.2
 pip install -e .[default]
 ```
 
 Or, install RCAEval from PyPI
 
 ```bash
 # Install RCAEval from PyPI
-pip install pip==20.0.2
 pip install RCAEval[default]
 ```