Better project URLs

"Source" is a better description for the GitHub repo than "Homepage".
Also adds a link to the changelog.

setup.cfg

@@ -4,7 +4,6 @@ version = 1.4.1
 description = silence linting errors by adding ignore/fixme comments
 long_description = file: README.md
 long_description_content_type = text/markdown
-url = https://github.com/samueljsb/silence-lint-error
 author = Samuel Searles-Bryant
 author_email = [email protected]
 license = MIT
@@ -14,6 +13,9 @@ classifiers =
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython
+project_urls =
+    Source = https://github.com/samueljsb/silence-lint-error
+    Changelog = https://github.com/samueljsb/silence-lint-error/blob/main/CHANGELOG.md
 
 [options]
 install_requires =