Add changelog URL to package metadata
Add changelog URL to package metadata

When Renovate bot creates an automated pull request to update packages, it can automatically include the link to changelog so it's easier to find out what changed.

The URL key has to be one of: 'changelog', 'change log', 'changes', 'release notes', 'news', "what's new" (case insensitive)

Code: https://github.com/renovatebot/renovate/blob/c3a87b687ed44a1a100e0e4f91b81e22b7c32482/lib/modules/datasource/pypi/index.ts#L130-L140
tobgu/pyrsistent,tobgu/pyrsistent,tobgu/pyrsistent