'description-file' will not be supported in future versions. (#1148)

UserWarning: Usage of dash-separated 'description-file' will not be supported in future versions. Please use the underscore name 'description_file' instead

Author: forsweet

setup.cfg

@@ -13,4 +13,4 @@ ignore_missing_imports = True
 test = pytest
 
 [metadata]
-description-file = README.rst
+description_file = README.rst