Update README.md

This is a filtered version of Philip May's German paraphrase dataset.

As the original author suggests, the dataset has been filtered, mostly following the guidelines set by the author. Any row that doesn't comply with the following conditions was filtered out:
- min_char_len < 25
- de_token_count > 30
- en_de_token_count > 30
- jaccard_similarity > 0.3
- cos_sim < 0.9

The dataset has been filtered for the sake of convenience, since smaller devices do not support such large files.

The filtered dataset contains 689150 rows.

## Licensing

Copyright (c) 2022 [Philip May](https://may.la/), [Deutsche Telekom AG](https://www.telekom.com/).

This work is licensed under [CC-BY-SA 4.0]([https://link-url-here.org](https://creativecommons.org/licenses/by-sa/4.0/).

README.md

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 license: cc-by-sa-4.0
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