The --d4 option is not working
Hi, I'm trying to run mosdepth with the --d4 option, but it doesn't seem to work. Here is the command I essentially run:

`mosdepth --d4 --fasta genome.hg38rg.fa example example.cram`

And I get this output:

`Usage: mosdepth [options] <prefix> <BAM-or-CRAM>`

I'm able to run mosdepth without the --d4 option.