slow chicken fall speed

chicken.lua

@@ -38,7 +38,7 @@ stepheight = 0.6,
 	lava_damage = 5,
 	light_damage = 0,
 	fall_damage = 0,
-	fall_speed = -8,
+	fall_speed = -4,
 	fear_height = 5,
 	animation = {
 		speed_normal = 15,