v0.7.0 Proto Assistants

This release adds a way to plugin assistants to the workflow. You can see this in action here: https://youtu.be/bQ4FhicQPvI

The interface will soon change as described here: #19

What's Changed

• Assistant plugin by @richiejp in #22
• readme: Update blurb and roadmap by @richiejp in #34

Full Changelog: v0.6.0...v0.7.0