Release v0.8.0

What's Changed

• Fixed a bug where validation failures were not resulting in a non-zero exit code
• [BREAKING] Renamed the --file / -f CLI argument to --config / -f for consistency with other tools
• improvements to validate output
  These "improvements" are short term hacks. There is a need for a fundamental
  overhaul of how output is generated to improve usability
• Implemented code coverage support.
• Updated the docs to reflect the removal of the --all flag