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Python: 3.8.6
pandas-ta: 0.2.23b0

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Describe the bug A clear and concise description of what the bug is.

These examples fails on the latest version:

The Default Strategy is the ta.AllStrategy. The following are equivalent:

df.ta.strategy() df.ta.strategy(“All”) df.ta.strategy(ta.AllStrategy)

Specifying specific categories work ([‘candles’, ‘momentum’, ‘overlap’, ‘performance’, ‘statistics’, ‘trend’, ‘volatility’, ‘volume’])

These have no effect on the result: dataframe.ta.mp = True dataframe.ta.mp = False

Error:

multiprocessing.pool.RemoteTraceback:
"""
Traceback (most recent call last):
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 125, in worker
    result = (True, func(*args, **kwds))
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 48, in mapstar
    return list(map(*args))
  File "/opt/tradebot/freqtrade/.env/lib/python3.8/site-packages/pandas_ta/core.py", line 432, in _mp_worker
    return getattr(self, method)(*args, **kwargs)
TypeError: crossed() got an unexpected keyword argument 'append'
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "./.env/lib/python3.8/site-packages/pandas_ta/core.py", line 682, in strategy
    [self._post_process(r, **kwargs) for r in results]
  File "./.env/lib/python3.8/site-packages/pandas_ta/core.py", line 682, in <listcomp>
    [self._post_process(r, **kwargs) for r in results]
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 448, in <genexpr>
    return (item for chunk in result for item in chunk)
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 868, in next
    raise value
TypeError: crossed() got an unexpected keyword argument 'append'

To Reproduce Download sample data and try the above examples.

Expected behavior All indicators added to dataframe.

Thanks for using Pandas TA! Thanks for a great TA library!