fix example

Author: plule

README.md

@@ -25,11 +25,12 @@ Displaying some information about the current world.
 ```no_run
 let mut client = dfhack_remote::connect().unwrap();
 let world_info = client.core().get_world_info().unwrap();
+let world_name = world_info.world_name.clone().unwrap().clone();
 
 println!(
     "Welcome to {} ({})",
-    world_info.world_name.last_name(),
-    world_info.world_name.english_name()
+    world_name.last_name(),
+    world_name.english_name()
 );
 ```