Update README.md

pip install  -r requirements.txt didn't work so I tried this worked
pip install --use-pep517 -r requirements.txt

README.md

@@ -32,6 +32,11 @@ Then put those 2 files on the "**models**" folder
 We highly recommend to work with a  `venv`  to avoid issues.
 ```
 pip install -r requirements.txt
+```
+or try if above failed
+```
+pip install --use-pep517 -r requirements.txt
+
 ```
 For MAC OS, You have to install or upgrade python-tk package:
 ```