About RPKM

[ESWRKJ]

Hello @EricKutschera
Thank you very much for your excellent work!
I was wondering if you have time now to consider changing RPKM to FRKM or maybe it would be better to change to TPM

[EricKutschera]

Here's another post asking for FPKM: #70

Adding that feature is not a priority for me, but feel free to open a pull request