tronUSDT top-level constant

Implementation

const tronUSDT = ERC20Entity(
  name: 'Tether USD',
  symbol: 'USDT',
  decimals: 6,
  contractAddress: "TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t",
  chainID: -2, // TODO: Make own Object for TRC20
);