release_2.0.0a1

API Changes

• Upgrade default Black version to 20.8b1 (#10696)

Bugfixes

• Fix test --debug to be hermetic, but keep
  run and repl non-hermetic (#10701)
• Properly fix setting a custom coverage config file (#10692)
• remoting: output directories in action results reference trees
  (#10691)

Refactoring, Improvements, and Tooling

• Unify logging implementations and remove simplelog (#10686)

Testing

• Rename run_rule to run_rule_with_mocks
  (#10702)
• Add RuleRunner as a Pytest-style replacement to
  TestBase (#10699)
• Remove unused TestBase setup (#10697)

Documentation

• Fix stale comments in logger.rs (#10695)
• Document rule graph construction and open issues (#10690)