Replace deprecated SPDX, update links, add topics

Author: krassowski

setup.cfg

@@ -5,7 +5,7 @@ long_description = file: ./README.md
 long_description_content_type = text/markdown
 author = Michał Krassowski
 author_email = krassowski.michal+pypi@gmail.com
-license =  LGPL-2.1
+license =  LGPL-2.1-or-later
 keywords =
     Docstring
     conversion
@@ -15,9 +15,11 @@ classifiers =
     Intended Audience :: Developers
     License :: OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+)
     Programming Language :: Python
+    Topic :: Text Processing :: Markup
+    Topic :: Documentation :: Sphinx
 project_urls =
-    Bug Tracker = https://github.com/krassowski/docstring-to-markdown/issues
-    Source Code = https://github.com/krassowski/docstring-to-markdown
+    Bug Tracker = https://github.com/python-lsp/docstring-to-markdown/issues
+    Source Code = https://github.com/python-lsp/docstring-to-markdown
 version = attr: docstring_to_markdown.__version__
 
 [mypy]