update README, data

data/MULTIWOZ2.1/README.txt

 Note that this is the mid 2019 version of MultiWOZ 2.1.
 The dataset has since been updated and the most recent version will therefore differ
-from the version we used for the experiments that we report in arXiv:2005.02877
+from the version we used for the experiments that we report in
+[TripPy: A Triple Copy Strategy for Value Independent Neural Dialog State Tracking](https://www.aclweb.org/anthology/2020.sigdial-1.4/)
+
+For the most recent version of MultiWOZ, please see https://github.com/budzianowski/multiwoz.git

data/woz2/README.md

+For WOZ 2.0 in multiple languages (English, German, Italian), please see https://github.com/guanlinchao/bert-dst/blob/master/storage/woz_2.0.zip
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