What's Changed
* Allow all constraint operations by shubhbapna in https://github.com/python-wheel-build/fromager/pull/171
* Give the user an option to use predefined urls to download sdists from by shubhbapna in https://github.com/python-wheel-build/fromager/pull/164
* Removed trailing _ from _patch_source method by rd4398 in https://github.com/python-wheel-build/fromager/pull/161
**Full Changelog**: https://github.com/python-wheel-build/fromager/compare/0.17.0...0.18.0