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MyCoin.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20Burnable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";

contract STKToken is ERC20, ERC20Burnable, Ownable {
    constructor(uint256 initialSupply) public ERC20("Stonks", "STK") {
        _setupDecimals(2);
        _mint(msg.sender, initialSupply);
    }

    function mintMore(address to, uint256 value) public onlyOwner returns (bool){
        _mint(to, value);
    }
}

Teste.sol

pragma solidity ^0.6.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";

contract STKToken is ERC20 {
    constructor(uint256 initialSupply) public ERC20("Stonks", "STK") {
        _mint(msg.sender, initialSupply);
    }
}