Cabrillo

Changes
- Allow empty lines in logs.
- Handle empty claimed score value as 0. (by report in 14)
- Generally attempt to make empty values more robust.

Added
- Add new CATEGORY additions to the Cabrillo spec since November 2020.

Fixed
- Replace stale Travis CI workflow badge with GitHub action's.

Added
- Add GRID-LOCATOR field. (11)
- Add more examples in README.

Fixed
- Fix setup.py authorship information.

Changes
- Add new Cabrillo fields. (9)

Added
- Cut first documented release.

Changes
- Fix UnicodeDecodeError when parsing non UTF-8 log files. (6)