python3Packages.bespon: fix license

The project is licensed under a 3-clause BSD license, not LGPL3.

pkgs/development/python-modules/bespon/default.nix

@@ -20,7 +20,7 @@ buildPythonPackage rec {
   meta = with lib; {
     description = "Encodes and decodes data in the BespON format.";
     homepage = "https://github.com/gpoore/bespon_py";
-    license = licenses.lgpl3;
+    license = licenses.bsd3;
     maintainers = with maintainers; [ synthetica ];
   };