setup.cfg: rename "{Source => Code}" and "{Tracker => Issues}"

For some reason, I like these labels better.

Author: generalmimon

setup.cfg

@@ -6,8 +6,8 @@ author_email = [email protected]
 url = https://kaitai.io
 project_urls =
     Documentation = https://doc.kaitai.io/
-    Source = https://github.com/kaitai-io/kaitai_struct_python_runtime
-    Tracker = https://github.com/kaitai-io/kaitai_struct_python_runtime/issues
+    Code = https://github.com/kaitai-io/kaitai_struct_python_runtime
+    Issues = https://github.com/kaitai-io/kaitai_struct_python_runtime/issues
     Gitter = https://gitter.im/kaitai_struct/Lobby
 description = Kaitai Struct declarative parser generator for binary data: runtime library for Python
 long_description = file: README.md