Warning on max_x

[steveklabnik]

src/worm.rs:16:2: 16:12 warning: code is never used: `max_x`, #[warn(dead_code)] on by default
src/worm.rs:16  max_x: i32,
                ^~~~~~~~~~

It's true this is never used. Are there plans to use it eventually, or would you like a patch removing it?

[alexchandel]

I was hoping it could be used for text formatting, like centering the score box, or for window resizing, but I don't really have any plans for it now.