Usage of targets argument in fill-mask pipeline (Pipeline cannot handle mixed args and kwargs)
I'm trying to use the `targets`  keyword in the fill mask pipeline as described in #6239 but I'm getting a `ValueError: Pipeline cannot handle mixed args and kwargs`

Full example

    nlp = pipeline('fill-mask', topk=2)
    nlp("The acting was believable and the action was outstanding. The sentiment of this review is <mask>.", targets=[' positive', ' negative'])

    ---------------------------------------------------------------------------
    ValueError                                Traceback (most recent call last)
    <ipython-input-44-2f6d875aee9b> in <module>
    ----> 1 nlp("The acting was believable and the action was outstanding. The sentiment of this review is <mask>.",
        2     targets=[' positive', ' negative'])

    ~/miniconda3/envs/huggingface/lib/python3.8/site-packages/transformers/pipelines.py in __call__(self, *args, **kwargs)
    1054
    1055     def __call__(self, *args, **kwargs):
    -> 1056         inputs = self._parse_and_tokenize(*args, **kwargs)
    1057         outputs = self._forward(inputs, return_tensors=True)
    1058

    ~/miniconda3/envs/huggingface/lib/python3.8/site-packages/transformers/pipelines.py in _parse_and_tokenize(self, padding, add_special_tokens, *args, **kwargs)
        503         """
        504         # Parse arguments
    --> 505         inputs = self._args_parser(*args, **kwargs)
        506         inputs = self.tokenizer(
        507             inputs, add_special_tokens=add_special_tokens, return_tensors=self.framework, padding=padding,

    ~/miniconda3/envs/huggingface/lib/python3.8/site-packages/transformers/pipelines.py in __call__(self, *args, **kwargs)
        167     def __call__(self, *args, **kwargs):
        168         if len(kwargs) > 0 and len(args) > 0:
    --> 169             raise ValueError("Pipeline cannot handle mixed args and kwargs")
        170
        171         if len(kwargs) > 0:

    ValueError: Pipeline cannot handle mixed args and kwargs



Looks like I was using v3.0.2 and this was introduced in v3.1.0