added fall grass to LBM

grass.lua

@@ -32,3 +32,34 @@ minetest.register_abm({
 	end
 end
 })
+
+minetest.register_lbm({
+	name = "mymonths:change_grass",
+	nodenames = {'default:dirt_with_grass', 'mymonths:fall_dirt'},
+	run_at_every_load = true,
+	action = function (pos, node)
+		local n = node.name
+		local month = tonumber(mymonths.month_counter)
+		local day = tonumber(mymonths.day_counter)
+
+		if month == 11
+		or month == 12
+		or month == 1
+		or month == 2 then
+			if n == 'default:dirt_with_grass' then
+				minetest.set_node(pos, {name = 'mymonths:fall_grass'})
+			end
+
+		elseif month == 4
+		or month == 5
+		or month == 6
+		or month == 7
+		or month == 8
+		or month == 9
+		or month == 10 then
+			if n == 'mymonths:fall_grass' then
+				minetest.set_node(pos, {name = 'default:dirt_with_grass'})
+			end
+		end
+	end
+})