Update README.md

README.md

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 license: cc-by-nc-sa-4.0
+pipeline_tag: fill-mask
+language: en
+datasets:
+- OpenSubtitles
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+##Model description
+This model is based on [An Exploration of Hierarchical Attention Transformers for Efficient Long Document Classification](https://arxiv.org/abs/2210.05529). Ilias Chalkidis, Xiang Dai, Manos Fergadiotis, Prodromos Malakasiotis, and Desmond Elliott. 2022. arXiv:2210.05529 (Preprint).