Fixed TypeScript definition for replaceRGB

BitmapData.replaceRGB's 'region' argument should be optional.

Author: twilligon

typescript/phaser.d.ts

@@ -272,7 +272,7 @@ declare module Phaser {
         processPixelRGB(callback: Function, callbackContext: any, x?: number, y?: Number, width?: number, height?: number): Phaser.BitmapData;
         rect(x: number, y: number, width: number, height: number, fillStyle?: string): Phaser.BitmapData;
         render(): Phaser.BitmapData;
-        replaceRGB(r1: number, g1: number, b1: number, a1: number, r2: number, g2: number, b2: number, a2: number, region: Phaser.Rectangle): Phaser.BitmapData;
+        replaceRGB(r1: number, g1: number, b1: number, a1: number, r2: number, g2: number, b2: number, a2: number, region?: Phaser.Rectangle): Phaser.BitmapData;
         resize(width: number, height: number): Phaser.BitmapData;
         resizeFrame(parent: any, width: number, height: number): void;
         setHSL(h?: number, s?: number, l?: number, region?: Phaser.Rectangle): Phaser.BitmapData;