Contracts - Crowdsale v2.5 and ERC20 v4
I'm trying to build a private whitelisted and vested crwodsale to an ERC220 token but having a hard time digging in libraries and most of the contracts like safemath and context don't match.
Is there a repository where I can look into crowdsaling with a preminted ERC20 token?
Environment
Remix 0.4.2 but want to improve to V0.8.7 for token and use the latest I can to crowdsale