Update setup.cfg

Author: dcherian

setup.cfg

@@ -4,9 +4,8 @@ author = dask_groupby Developers
 author_email = [email protected]
 license = Apache
 description = GroupBy operations for dask.array
-long_description_content_type=text/x-rst
-long_description =
-    Map-reduce style groupby operations for dask.array
+long_description = file: README.md
+long_description_content_type=text/markdown
 
 url = https://github.com/dcherian/dask_groupby
 classifiers =
@@ -23,6 +22,7 @@ classifiers =
     Topic :: Scientific/Engineering
 
 [options]
+packages = find:
 zip_safe = False  # https://mypy.readthedocs.io/en/latest/installed_packages.html
 include_package_data = True
 python_requires = >=3.7