Missing set Settings

Missing set Settings.

https://github.com/amir20/phantomjs-node#pagesetting
http://phantomjs.org/api/webpage/property/settings.html

types/phantom/index.d.ts

@@ -34,6 +34,7 @@ export interface WebPage {
     property<T>(key: string, value: T): Promise<void>;
 
     setting<T>(key: string): Promise<T>;
+    setting<T>(key: string, value: T): Promise<T>;
 
     addCookie(cookie: ICookie): Promise<boolean>;
     deleteCookie(cookieName: string): Promise<boolean>;