message: Update README.md
  notice duplicate erc721 code:
diff: @@ -102,14 +102,6 @@ await matic.tokenOfOwnerByIndexERC721(
  options // transaction fields
  )
  -// get ERC721 token ID
  -await matic.tokenOfOwnerByIndexERC721(
  - from, // User address
  - tokenAddress, // Token address
  - index, // index of tokenId
  - options // transaction fields
  -)
  -
  // Deposit Ether into Matic chain
  await matic.depositEthers(
  options // transaction fields
  