Update main.zig

src/areas.zig

@@ -45,7 +45,7 @@ pub const Areas = struct {
         self.allocator.free(self.areas);
     }
 
-    pub fn draw(self: *Areas) void {
+    pub fn draw(self: *const Areas) void {
         for (self.areas) |area| {
             area.draw();
         }