This version includes a hotfix to an issue that prevented ethers from working with Buidler.
This version temporarily changed how buidler-ethers manages the gas setting in your networks, by substracting 1M from it. If this brings you any problem, you can increase it by 1M, making sure that it won't go beyond the block gas limit. In the case of the buidlerevm network, you can increase the block gas limit.
For more information about these settings, please go to: https://buidler.dev/config/#networks-configuration