Bump the recommended cookiecutter version to 2.4.0

The version 2.2.3 is broken (see #134) and there have been some
improvements in the latest versions that make updating existing projects
easier (for example it is not necessary to keep the extensions in the
replay file).

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

README.md

@@ -31,7 +31,7 @@ Cookiecutter](https://cookiecutter.readthedocs.io/en/stable/installation.html).
 It is normally available in any Linux distribution, but some have a very old
 version (for example, Ubuntu/Debian). You can [check which version your distro
 has on Repology](https://repology.org/project/cookiecutter/versions). You need
-**at least version 2.1.0**. To ensure you get an up-to-date version, you can
+**at least version 2.4.0**. To ensure you get an up-to-date version, you can
 always use `pip` and install it in a `venv`:
 
 ```console

docs/index.md

@@ -19,7 +19,7 @@ Cookiecutter](https://cookiecutter.readthedocs.io/en/stable/installation.html).
 It is normally available in any Linux distribution, but some have a very old
 version (for example, Ubuntu/Debian). You can [check which version your distro
 has on Repology](https://repology.org/project/cookiecutter/versions). You need
-**at least version 2.1.0**. To ensure you get an up-to-date version, you can
+**at least version 2.4.0**. To ensure you get an up-to-date version, you can
 always use `pip` and install it in a `venv`:
 
 ```console