There's room for yi buffs in the assassin rework

So it's been a while since Yi was nerfed multiple times to pigeonhole him into building devourer + rageblade. Devourer has been removed and rageblade has been reworked into a mediocre item he can't make use of anymore.

I think he's due for some buffs. For those that are worried he'll start terrorizing low elo again, his performance appears to be mediocre in bronze/silver right (45-46% respectively) over the past month so I think we have plenty of room for buffs without breaking him in lower brackets. http://na.op.gg/statistics/champion/