Bug fixes, changing him to where he feels smoother, these are acceptable. But increasing his already absurd burst? No. Just. No. Stop it rito. Bad. Bad rito! Bad! For real though, this isn't coming from a salty Jhin main who has been the victim of constantly getting mugged by a Rengar one trick. If anything, I AM the Rengar one trick who's been mugging all the poor Jhins in the world. Apparently the reason for buffing Rengar's Q is simply because it doesn't deal as much burst as it did before, but the truth is quite the opposite. True, it may not deal as much as his old Q, BUT it counts as an auto, meaning that he has amazing synergy with things such as Duskblade, Shiv, IE, and Dark Harvest, and can actually deliver even more burst damage than before. If you build correctly and know what you're doing, you should be doing things like this: QUEUE THE MONTAGE!
https://www.youtube.com/watch?v=752v3jXqYY4 https://www.youtube.com/watch?v=sYOSFjkGlAg https://www.youtube.com/watch?v=8Qb_8LsE2hM
So, as you can see (assuming that you didn't skip though the vids like an asshole) he already does more than enough damage. So to increase his already absurd burst would be an overkill. Once again, I am a Rengar main, not some salty AD carry. And if a Rengar one trick believes buffing his main is a bad idea, that says something doesn't it? O~O