Update README.md

README.md

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-"hello" 
+This model is a fine-tune checkpoint of DistilBERT-base-uncased, fine-tuned on SST-2. This model reaches an accuracy of 91.3 on the dev set (for comparison, Bert bert-base-uncased version reaches an accuracy of 92.7).
+
+Fine-tuning hyper-parameters
+learning_rate = 1e-5
+batch_size = 32
+warmup = 600
+max_seq_length = 128
+num_train_epochs = 3.0