setup.cfg: switch to metadata.license_files

See https://github.com/pypa/setuptools/pull/2620

diff --git a/setup.cfg b/setup.cfg
index f7bfe23cf5412982ea828fdc5b512fa1871e102f..ac49ca54ee7f6f0085e867926a230ed8fe01ffab 100644 (file)
--- a/setup.cfg
+++ b/setup.cfg
@@ -8,4 +8,4 @@ filterwarnings =
     ignore:babel.numbers.format_decimal:DeprecationWarning
 
 [metadata]
-license_file = LICENSE
+license_files = LICENSE