Update README.md

README.md

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 license: cc-by-4.0
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-A processed subset of the [ProofWriter dataset](https://allenai.org/data/proofwriter).
+A processed subset of the OWA section of the [ProofWriter dataset](https://allenai.org/data/proofwriter).
 Each train/test split contains 600 entries, each of which has a unique set of theories and a single question for those theories.
-Both splits are balanced so that the depth of the proof required to answer the question varies evenly between 1-5 (100 entries each).
+Both splits are balanced so that the depth of the proof required to answer the question varies evenly between 1-5 (100 entries each).
+'Unknown' labels have been replaced by 'Uncertain' to match other datasets.