Removed Objective-C runtime TODOs from todo.md.
Removed Objective-C runtime TODOs from todo.md.

HunterChen/ui,janstk/ui,UIKit0/ui,cainiaocome/ui,ProtonMail/ui,292388900/ui,UIKit0/ui,cainiaocome/ui,beni55/ui,292388900/ui,HunterChen/ui,mirrr/ui,janstk/ui,mirrr/ui,beni55/ui,mirrr/ui,robbiev/ui,hajimehoshi/ui,ProtonMail/ui,beni55/ui,ProtonMail/ui,UIKit0/ui,hajimehoshi/ui,robbiev/ui,HunterChen/ui,292388900/ui,cainiaocome/ui,robbiev/ui,janstk/ui,hajimehoshi/ui