Merge pull request #176 from webknjaz/patch-1 - improve description.

setup.cfg

@@ -2,7 +2,7 @@
 name = distlib
 version = attr: distlib.__version__
 description = Distribution utilities
-long_description = Low-level components of distutils2/packaging, augmented with higher-level APIs for making packaging easier.
+long_description = file: README.rst
 url = https://github.com/pypa/distlib
 author = Vinay Sajip
 author_email = vinay_sajip@red-dove.com