[assoc-agg] Does CWL still have weirdness with chrX? what is that weirdness anyway?

[aofarrel]

Assoc agg's readme used to say:

This pipeline tends to drop non-autosomes about halfway through (it will not thrown an error). The CWL implementation likewise handles non-autosomes oddly, but in a different way. We are working with the SBG team for more information, but for now, I gently advise against using this for non-autosomes.

I don't remember what the CWL was doing. Removing this note from the readme for now, as I fixed the dropping error and both the CWL and WDL are giving something for X, but it might be worth looking into what was going on when I wrote this.