CoFiX v2.1 was adjusted the impact cost algorithm

The impact cost algorithm was adjusted as follows.

C = vol * β, β = 0.00001

Upgrade time: Aug-16-2021 07:50 AM +UTC

github: https://github.com/Computable-Finance/CoFiX-V2.1

CoFiXCore

2021.08.16