Update README.md

'ubinary' data type gives error when running the code, change to 'float32'

README.md

@@ -2655,7 +2655,7 @@ docs = [
 embeddings = model.encode(docs)
 
 # Optional: Quantize the embeddings
-binary_embeddings = quantize_embeddings(embeddings, precision="ubinary")
+binary_embeddings = quantize_embeddings(embeddings, precision="float32")
 
 similarities = cos_sim(embeddings[0], embeddings[1:])
 print('similarities:', similarities)