Update README.md

README.md

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 The training dataset of this model  consists of 23 million tweets in Greek, of approximately 5000 users in total, spanning from 2008 to 2018.
-The model has been trained to support the work for the paper. [[Multimodal Hate Speech Detection in Greek Social Media (preprint v1)](https://www.preprints.org/manuscript/202103.0390/v1 ) ]
+The model has been trained to support the work for the paper [Multimodal Hate Speech Detection in Greek Social Media (preprint v1)](https://www.preprints.org/manuscript/202103.0390/v1 ) ]
 
 
 ## Load the pretrained model