Update knockout.d.ts

Added after? option  to KnockoutBindingHandler

knockout/knockout.d.ts

@@ -142,6 +142,7 @@ interface KnockoutAllBindingsAccessor {
 }
 
 interface KnockoutBindingHandler {
+    after?: Array<string>;
     init?: (element: any, valueAccessor: () => any, allBindingsAccessor?: KnockoutAllBindingsAccessor, viewModel?: any, bindingContext?: KnockoutBindingContext) => void | { controlsDescendantBindings: boolean; };
     update?: (element: any, valueAccessor: () => any, allBindingsAccessor?: KnockoutAllBindingsAccessor, viewModel?: any, bindingContext?: KnockoutBindingContext) => void;
     options?: any;