setup.cfg: address warning when building the package

PMeira · PMeira · commit 9489e0caec90 · 2023-06-10T00:48:17.000-03:00
diff --git a/setup.cfg b/setup.cfg
@@ -1,4 +1,4 @@
 [metadata]
 description_file = README.md
-license_file = LICENSE
+license_files = LICENSE
 url = https://github.com/dss-extensions/dss_python
