Keeping left or right arrow pressed doesn't change visualisation width #56

Hello,

I'm using binocle v0.3.2 on Arch Linux from the official repo.

I don't know if this is intentionnal or a regression, but I used to decrease the width of the visualisation by keeping the left arrow key pressed.

Now, the width only decrease by one when I press and keep pressed the left arrow key, which means that I have to press the key repeatedly, or just use the mouse, which I find less convenient.

Best regards.