uniswap v2 滑动窗口的twap价格实现；请参考合约目录下的ExampleSlidingWindowOracle;
- chainlink vs twap: https://smartcontentpublication.medium.com/twap-oracles-vs-chainlink-price-feeds-a-comparative-analysis-8155a3483cbd
- univ2 twap github: https://github.com/Uniswap/v2-periphery/tree/master/contracts/examples
- slideWindowsOracle: https://www.cxyzjd.com/article/weixin_39430411/109262196