Please can help me converting it to upgradable contract 0.8.0? this is your version for deflationary model
Environment
Truffle,truffle-flatterner,
Details
Code to reproduce
pragma solidity ^0.5.0;
import "@openzeppelin/upgrades/contracts/Initializable.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20Detailed.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20Mintable.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20Pausable.sol";
/**
* @title MyToken
* @dev ERC20 Token example, where all tokens are pre-assigned to the creator.
* Note they can later distribute these tokens as they wish using `transfer` and other
* `ERC20` functions.
*/
contract MyToken is Initializable, ERC20, ERC20Detailed, ERC20Mintable, ERC20Pausable {
uint256 private _minimumSupply;
/**
* @dev Gives holder all of existing tokens.
*/
function initialize(address holder, address minter, address pauser) public initializer {
ERC20Detailed.initialize("MyToken", "MYT", 18);
ERC20Mintable.initialize(minter);
ERC20Pausable.initialize(pauser);
_minimumSupply = 2000 * (10 ** 18);
_mint(holder, 10000 * (10 ** uint256(decimals())));
}
function transfer(address to, uint256 amount) public returns (bool) {
return super.transfer(to, _partialBurn(amount));
}
function transferFrom(address from, address to, uint256 amount) public returns (bool) {
return super.transferFrom(from, to, _partialBurn(amount));
}
function _partialBurn(uint256 amount) internal returns (uint256) {
uint256 burnAmount = _calculateBurnAmount(amount);
if (burnAmount > 0) {
_burn(msg.sender, burnAmount);
}
return amount.sub(burnAmount);
}
function _calculateBurnAmount(uint256 amount) internal view returns (uint256) {
uint256 burnAmount = 0;
// burn amount calculations
if (totalSupply() > _minimumSupply) {
burnAmount = amount.mul(3).div(100);
uint256 availableBurn = totalSupply().sub(_minimumSupply);
if (burnAmount > availableBurn) {
burnAmount = availableBurn;
}
}
return burnAmount;
}