Remove acronym from Readme

README.md

@@ -32,8 +32,8 @@ pragma solidity ^0.6.0;
 
 import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
 
-contract MyNFT is ERC721 {
-    constructor() ERC721("MyNFT", "MNFT") public {
+contract MyCollectible is ERC721 {
+    constructor() ERC721("MyCollectible", "MCO") public {
     }
 }
 ```