v0.3.0

This release incorporates months of work on updating the experimentation workflow for hotstuff. Now we have a brand new tool that can deploy and execute experiments on remote servers and collect results -- all written in Go!

This release also introduces a new module system, an implementation of a simplified hotstuff protocol, and other improvements.

Some of the APIs are now maturing, while many are changed since the last release. I have more experience with the system as a whole now, so I hope the APIs will remain somewhat stable in the future.