updated README

Author: btr1975

README.md

@@ -20,10 +20,18 @@ pip install cookiecutter
 
 3. Use the cookiecutter repository to create your structure.
 
+* Use the latest
+
 ```text
 cookiecutter https://github.com/btr1975/cookiecutter-python-fastapi-openapi
 ```
 
+* Use a specific version
+
+```text
+cookiecutter https://github.com/btr1975/cookiecutter-python-fastapi-openapi -c 1.0.1
+```
+
 4. Now you will be asked a series of questions. This is an example
    **THE QUESTIONS MAY NOT BE THE EXACT FOR THIS COOKIECUTTER**, also if you have downloaded it before
    you will be asked if you want to download it again, always say yes to get the latest version.