Fix delta checking on handle update

[joshrickert]

Very minor, but I assume there was a typo here. A conditional on

delta <= 0 && delta < 1

makes no sense, because the second statement definitely false if the first is. It seems like you meant to check if the delta was between 0 and 1.

[ValentinH]

I guess you're right because it doesn't make sense. However, this code is linked with #74 and we need to find a solution.

Actually, delta < 1 is enough because delta comes from Math.abs() so it's obviously above 0