const approve = new ApproveErc20();
approve.contractAddress = '0x874069Fa1Eb16D44d622F2e0Ca25eeA172369bC1';
approve.spender = '0x8cb76aEd9C5e336ef961265c6079C14e9cD3D2eA';
approve.chain = Currency.CELO;
approve.feeCurrency = Currency.CELO;
approve.amount = '0.001015';
approve.fromPrivateKey = '0x4874827a55d87f2309c55b835af509e3427aa4d52321eeb49a2b93b5c0f8edfb';
approve.fee = {gasPrice: '5', gasLimit: '300000'};
console.log(await sendAuctionApproveErc20Transfer(true, approve, 'https://alfajores-forno.celo-testnet.org'));