The current year.
Complaining about Riven.
Well guess what you're going to get equally wrecked by irelia, fiora and actually most fighter type champions with decent mobility.
As for how to deal with her as Jhin I'd suggest:
-Improving your positioning, if she can't get to you, she won't deal any damage, her mobility is very linear and it doubles as her defence mechanism and damage, the more she uses to gapclose, the less damage she'll deal. That said, be carefull of a flash+engage.
-Ask and pray for better peel from your teammates, again, if she can't get to you, she can't damage you.
-in the midgame if you overextend while farming and botside is badly warded, she'll probably look for a pick on you. So, 1. don't overextend 2. Ward 3. Don't even try to 1v1 her.
Also a nice tip for you: If you're blue side, ward so that you have vision on the wall next to gromp, I tend to get more picks on farming ADCs then I should by wallhopping over that wall.
-Stack MS, Late game, if you don't get flanked or flashed upon, there might be instances where you can actually kite her, assuming she burns half of her mobility on trying to get to you. Crit her once for the MS boost, grab Ghostblade AND Swifties. Other good items on Jhin that give MS are for example Duskblade, RFC and PD.
In such a situation that she comes running up to you and you have little to no peel, she's probably going to flash onto you with her 3rd Q, so anticipate that, flash her 3rd Q and outplay her.
Source: I play a fair bit of Riven and smacked/got smacked by, a few Jhins here and there in Ranked.