readme and example fix

Author: selimanac

main/main.script

@@ -2,7 +2,7 @@ local map_width = 5
 local map_height = 4
 local direction = astar.DIRECTION_EIGHT
 local allocate = map_width * map_height
-local typical_adjacent = map_width * map_height
+local typical_adjacent = 8
 local cache = true      -- Optional. Default is true
 local use_zero = false  -- Optional. Default is false = 1 based
 local map_vflip = false -- Optional. Default is false
@@ -30,8 +30,6 @@ local entities = {
 }
 
 function init(self)
-	local map_id = astar.new_map_id()
-
 	astar.setup(map_width, map_height, direction, allocate, typical_adjacent, cache, use_zero, map_vflip)
 	astar.set_map(world)
 	astar.set_costs(costs)