WARNING:transformers.tokenization_utils:Keyword arguments {'add_space_before_punct_symbol': True} not recognized.
# 🐛 Bug

## Information

Model I am using (Bert, XLNet ...):
ctrl

Language I am using the model on (English, Chinese ...):
English
The problem arises when using:
* [ ] the official example scripts: (give details below)
```
python run_generation.py \
    --model_type ctrl \
    --model_name ctrl --length=100 --temperature 0.2 --num_return_sequences=5 --p=0.8 --seed=17 --repetition_penalty=1.2 
```

## Expected behavior

<!-- A clear and concise description of what you would expect to happen. -->

## Environment info
<!-- You can run the command `transformers-cli env` and copy-and-paste its output below.
     Don't forget to fill out the missing fields in that output! -->

```
- `transformers` version: 3.0.1
- Platform: Darwin-19.5.0-x86_64-i386-64bit
- Python version: 3.7.4
- PyTorch version (GPU?): 1.2.0 (False)
- Tensorflow version (GPU?): 2.1.0 (False)
- Using GPU in script?: no
- Using distributed or parallel set-up in script?: no
```