message: [truffle-v4] Add EIP1559 transaction overrides
  Tried doing a search for maxPriorityFeePerGas and maxFeePerGas in Truffle
  repo. Got only one result:
  Seems that they don't have any types exported.
diff: @@ -40,6 +40,8 @@ declare namespace Truffle {
  from?: string
  gas?: BigNumber | number | string
  gasPrice?: BigNumber | number | string
  + maxPriorityFeePerGas?: BigNumber | number | string
  + maxFeePerGas?: BigNumber | number | string
  value?: BigNumber | string
  }
  