Bump flat, hardhat, mocha and truffle#131

dependabot[bot] wants to merge 1 commit intomasterbackstop-protocol/BCompound:masterfrom

dependabot/npm_and_yarn/flat-and-hardhat-and-mocha-and-truffle-5.0.2backstop-protocol/BCompound:dependabot/npm_and_yarn/flat-and-hardhat-and-mocha-and-truffle-5.0.2Copy head branch name to clipboard