Add Some Info To Rankings

[lsbyerley]

I posted this in your other repo, and I'm not sure if its active anymore, so, I'll put this here as well. I've been using your api ranking endpoints for draft preparation, mainly https://jayzheng-ff-api.herokuapp.com/rankings?format=half_ppr

I'm curious if it would be possible to add the positional tier (not just overall tier), and the positional ranking (not just overall rank) to each player object.

Maybe something like posRank and posTier ?