fix: long_description_content_type added

The long_description_content_type parameter is added to the setup() function to explicitly specify that the long description content is in reStructuredText format.

{{ cookiecutter.package_name }}/setup.py

@@ -37,6 +37,7 @@ def load_about():
     license="{{ cookiecutter.license }}",
     description="{{ cookiecutter.description }}",
     long_description=load_readme(),
+    long_description_content_type="text/x-rst",
     packages=find_packages(exclude=["tests*"]),
     include_package_data=True,
     python_requires=">=3.8",