Updating hapi.d.ts to support optional parameters when registering a plugin

hapi/hapi.d.ts

@@ -2051,11 +2051,13 @@ declare module "hapi" {
 		register(plugins: any|any[], options: {
 			select: string|string[];
 			routes: {
-				prefix: string; vhost: string|string[]
+				prefix: string; vhost?: string|string[]
 			};
 		}
 			, callback: (err: any) => void):void;
 
+		register(plugins: any|any[], callback: (err: any) => void):void;
+
 		/**server.render(template, context, [options], callback)
 		Utilizes the server views manager to render a template where:
 		template - the template filename and path, relative to the views manager templates path (path or relativeTo).