mudra-ml 0.5.2

This is a documentation release. No code changed.

The README was rewritten to describe the current capabilities and the trust
model. It now states what the tool is in one sentence, what makes it different,
how to install the base package and the optional boosting and file extras, a
quickstart verified against the current API, what the report contains in
pipeline order, how a saved model reloads and predicts, the real
classification, regression, and clustering rosters, and the honest scope and
limits.

The license and changelog links were also made absolute so they render
correctly on the package page.