Fix/reload data animation glitch fix

[anton-plebanovich]

Fixes https://github.com/adamshin/SwiftReorder/issues/6

Fixed animation glitch when try to reload rows in a long list with dynamic cells. You can check a bug here - https://github.com/anton-plebanovich/SwiftReorder/tree/f7afafd9a5518d6b8c06b69f119ef1a64e4a66db And a fix here - https://github.com/anton-plebanovich/SwiftReorder/tree/9b2744abbd8817769f8fa9335f4e0949f88b91f8

[zbockskopf]

Is it possible to get this commit merged soon?