Loosening bound on `max_err`'s exponent in `intersect-1-13`.
Loosening bound on `max_err`'s exponent in `intersect-1-13`.

See: https://ci.appveyor.com/project/dhermes/bezier/build/1.0.493.master/job/i2qfkwyt0kll6y2b

dhermes/bezier,dhermes/bezier,dhermes/bezier