TodoApp. Minor fixes due to API changes (#548)

examples/todoapp/ios/ios/RootView.swift

@@ -10,7 +10,7 @@ struct RootView: View {
     }
     
     var body: some View {
-        let child = self.routerStates.value.activeChild.component
+        let child = self.routerStates.value.activeChild.instance
         
         switch child {
         case let main as TodoRootChild.Main:

examples/todoapp/ios/ios/SimpleRouterState.swift

@@ -3,9 +3,9 @@ import Todo
 func simpleRouterState<T : AnyObject>(_ child: T) -> Value<RouterState<AnyObject, T>> {
     return valueOf(
         RouterState(
-            activeChild: RouterStateEntryCreated(
+            activeChild: ChildCreated(
                 configuration: "config" as AnyObject,
-                component: child
+                instance: child
             ),
             backStack: []
         )