No method found in BigInt.swift file

[hanklee9820]

The environment：xcode 10.2

[oday0311]

this is ok in xcode.10.1, we just found this problem,

[oday0311]

both these two functions of sanitycheck and precondition are use to check the data , so , you can use other funtions to instead, or just comment these check code,,,.

[oday0311]

updated in latest commit,, thanks for your remind

[hanklee9820]

@oday0311 roger that！Thanks for your project, which makes my work more smooth！