Utility functions for interacting with OpenSea API
npm install opensea-sdk --save
const openSea = new OpenSeaSDK();
const openSeaTestnet = new OpenSeaSDK('rinkeby');
...
const = openSeaOptions = {};
openSea.mintNFT(openSeaOptions, 'ERC721');
openSea.mintNFT(openSeaOptions, 'ERC1155');