Update README.md

Author: Roberto De Ioris

README.md

@@ -544,7 +544,7 @@ This works like PyActor, but this time you generate a new Pawn class (that you c
 The 'World' concept
 -------------------
 
-Every uobject is mapped to a world (UWorld in c++). Generally when you play on a Level your objects all live in the same world, but at the same time there could be multiple worlds (for example while testing in the editor there is a world for the editor and one for the simulation)
+Every actor is mapped to a world (UWorld in c++). Generally when you play on a Level your objects all live in the same world, but at the same time there could be multiple worlds (for example while testing in the editor there is a world for the editor and one for the simulation)
 
 While it is pretty rare to reference other worlds, you may need to compare the world of two uobject's (for example you may have a reference in your python module to a uobject of a hidden world and you want to check if you need to use it).