Restored the copyright header accidentially not kept in the semi-automatic conversions.

KOLANICH · KOLANICH · commit 664111c0c87f · 2022-05-12T11:53:26.000+03:00
diff --git a/setup.cfg b/setup.cfg
@@ -1,3 +1,6 @@
+# Copyright 2017-2020 Palantir Technologies, Inc.
+# Copyright 2021- Python Language Server Contributors.
+
 [metadata]
 name = python-lsp-jsonrpc
 author = Python Language Server Contributors
