fix: adjust setup.py

setup.py

@@ -1,18 +1,22 @@
+from pathlib import Path
 from setuptools import find_packages
 from setuptools import setup
 
 
-with open("README.rst") as myfile:
-    long_description = myfile.read() + "\n"
-with open("CHANGES.rst") as myfile:
-    long_description += myfile.read()
 version = "4.0.3.dev0"
 
+long_description = (
+    f"{Path('README.rst').read_text()}\n{Path('CHANGES.rst').read_text()}"
+)
+
 setup(
     name="Products.CMFEditions",
     version=version,
     description="Versioning for Plone",
     long_description=long_description,
+    long_description_content_type="text/x-rst",
+    # Get more strings from
+    # https://pypi.org/classifiers/
     classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Environment :: Web Environment",