setup.py: use README.md file as long_description (required by latest stdeb lib)

setup.py

@@ -45,10 +45,14 @@ for extra, deps in extras_require.items():
 
 version = "0.1"
 
+with open("README.md", encoding="utf-8") as fd:
+    long_description = fd.read()
+
 setup(
     name="mylib",
     version=version,
     description="A set of helpers small libs to make common tasks easier in my script development",
+    long_description=long_description,
     classifiers=[
         "Programming Language :: Python",
     ],