dataframe

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Description
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Support Series.between

sin, cos, etc.

In rust this is not needed as we can easily call apply(_cast)

We should be able to pass a dataset to a function called train_test_split and get back splits of training and testing data similar to the sklearn train_test_split function here.
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Hi @twopirllc ,
Could you please add the Connors RSI (CRSI) indicator?

About CRSI
Code for reference

Also doc for [Aroon](https://github.com/twopirllc/pandas-ta/blob/1deb7559f626d2a5cf664b6c0af7a8016a53bfca/pan

Hi ,

I am using some basic functions from pyjanitor such as - clean_names() , collapse_levels() in one of my code which I want to productionise.
And there are limitations on the size of the production code base.
Currently ,if I just look at the requirements.txt for just "pyjanitor" , its huge .
I don't think I require all the dependencies in my code.
How can I remove the unnecessary ones ?

I'm using black and isort for other projects (see e.g. https://github.com/hyperopt/hyperopt/pull/748/files) and find them quite useful to have more consistent codebase. I think you should drop python3.5 support though, as black is python3.6+. Is this something you would be open to consider?