Consider: Use latest version of Solidity compiler.

https://github.com/Uniswap/uniswap-v2-core/blob/3129c726821e374ac6ffabea363413f2349c1805/contracts/UniswapV2Exchange.sol#L1

Consider bumping to latest version of Solidity before releasing.  At the least, I recommend reviewing all fixed Solidity bugs between latest and this version to make sure that none of them affect you.