Timeout after 10.0min

Use the --timeout flag to change the timeout.

Reproduce

herbie shell --seed 2020322 
(FPCore (a b_2 c)
  :name "quad2p (problem 3.2.1, positive)"
  :precision binary64
  (/ (+ (- b_2) (sqrt (- (* b_2 b_2) (* a c)))) a))