Update README.md

README.md

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 license: mit
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-# [retentive networks](https://arxiv.org/abs/2307.0862)  (https://arxiv.org/abs/2307.0862)
+# [retentive networks](https://arxiv.org/abs/2307.0862)  https://arxiv.org/abs/2307.0862
 
 retnet_base