Fix typo in Python binding README
Trailing paren causes an error
@@ -158,7 +158,7 @@ tokenizer = Tokenizer(models.BPE.empty())
# Customize pre-tokenization and decoding
tokenizer.pre_tokenizer = pre_tokenizers.ByteLevel.new(add_prefix_space=True)
-tokenizer.decoder = decoders.ByteLevel.new())
+tokenizer.decoder = decoders.ByteLevel.new()
# And then train
trainer = trainers.BpeTrainer.new(vocab_size=20000, min_frequency=2)
