2.4.3

# Changelog - [x] time penalty is now properly applied to each miner, fixes issue where miners that submitted the same chunks would share a time penalty (whoever had their chunks graded first) - [x] The tie alpha calculation now caps the maximum divisor to 5. This means that even if 6 miners tie, the alpha values will only reflect that 5 miners tied. - [x] New impl for checking if chunks properly account for sentence boundaries. Avoids edge cases from before as `nltk.sent_tokenize` tokenizer can make different sentence splits when run with the whole document vs with an individual chunk of text. # Checklist - [x] all tests pass - [x] version bump - [x] doc updates