Update solidity version?

[tomwhipple]

https://github.com/OpenZeppelin/ethernaut/blob/a7e5b7dbfc264bde771c601ffa8bcb1d299cd1ee/contracts/contracts/levels/CoinFlip.sol#L2

It seems that SafeMath.sol is looking for Solidity >= 0.8.0... I wonder if this is part of the issue I'm having with Remix, but I'm still very new at this otherwise I'd submit a PR.

[RajivIshrani]

Solidity 0.8, the overflow/underflow check is implemented on the language level - it adds the validation to the bytecode during compilation.

You don't need the SafeMath library for Solidity 0.8+. You're still free to use it in this version, it will just perform the same validation twice (one on the language level and one in the library).

[xaler5]

Updated all contracts to Solidity 0.8 :) closing this issue as it seems everything is resolved