Riot Games crippled Akali with the nerfs in patch 10.3 and then figured out she should be compensated in some way so a micropatch happened with rather strong buffs for her and moderate buffs to master of AFK supporting - Yuumi, the Magical Cat.
Akali got several hard nerfs in League of Legends patch 10.3. Her Q became more expensive to cast, effectively reducing her damage potential, Twilight Shroud's speed bonus got changed to a single boost on cast and the ultimate can no longer be cast freely - it has to target an enemy champion.
Following her abysmal win rate in solo queue, Riot saw enough evidence to figure out they hit her too hard. It's not that the developers were unaware of the wildly different impact she has in solo queue compared to pro play but the nerfs still went through and then they were compensated for on 6 February 2020.
Shuriken Flip (E) now does more base damage at all ranks, ranging from 10 at rank one to 30 at rank five. While not necessarily a groundbreaking change, it should give Akali more kill potential if she commits the ability to chase an enemy down.
Perfect Execution (R) got a more significant change though. The cooldown has almost been halved, going from 160/130/100 to 120/90/60 seconds, meaning she will be able to chase targets down much more often. Furthermore, the damage on the first dash has been increased from 85/150/215 to 125/225/325.
Considering that Akali can no longer use Perfect Execution as an escape tool directly, making it more lethal makes sense but it remains to be seen whether she will be deemed too sticky with the new cooldowns.
Meanwhile, Yuumi will get some of her early poke potential back as the Q base damage has been increased at later ranks. The cat's heal from E has also been increased at later ranks which should help her mid-game when combined with the Q buff.