simplify random img function

main.go

@@ -13,9 +13,8 @@ func main() {
 	flag.Parse()
 
 	// get two random images and load them
-	imgs := getRandomImages(2)
-	img1 := loadImage(imgs[0])
-	img2 := loadImage(imgs[1])
+	img1 := loadImage(getRandomImage())
+	img2 := loadImage(getRandomImage())
 
 	// pool of workers unionizing, ready to blend a new picture using the power of friendship
 	var pool blendWorkerPool