- Update to 0.3.0
* Provide both the requirements and their parents as exceptiondata for the
``ResolutionImpossible`` exception, via a ``causes`` attribute that replaces
the previous ``requirements`` attribute.
* Make resolver backtrack when none of the candidates requested for a package
are able to resolve due to them requesting unworkable requirements, or a
package has no candidates at all. Previously the resolver would give up on the
spot.
* Ensure the result returned by the resolver only contains candidates that are
actually needed. This is done by tracing the graph after resolution completes,
snipping nodes that don’t have a route to the root.
OBS-URL: https://build.opensuse.org/request/show/794545
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-resolvelib?expand=0&rev=5
