fix: UniswapV2ERC20.sol

.gitignore

@@ -3,4 +3,8 @@ node_modules
 .vscode
 /cache
 */artifacts
-*/.deps
+*/.deps
+*/*/artifacts
+*/*/.deps
+*/*/*/artifacts
+*/*/*/.deps

contracts/liquidityPools/core/UniswapV2ERC20.sol

@@ -6,17 +6,17 @@ import './libraries/SafeMath.sol';
 contract UniswapV2ERC20 is IUniswapV2ERC20 {
     using SafeMath for uint;
 
-    string public override constant name = 'Uniswap V2';
-    string public override constant symbol = 'UNI-V2';
-    uint8 public override constant decimals = 18;
-    uint  public override  totalSupply;
-    mapping(address => uint) public override balanceOf;
-    mapping(address => mapping(address => uint)) public override allowance;
+    string public constant name = 'Uniswap V2';
+    string public constant symbol = 'UNI-V2';
+    uint8 public constant decimals = 18;
+    uint  public  totalSupply;
+    mapping(address => uint) public balanceOf;
+    mapping(address => mapping(address => uint)) public allowance;
 
-    bytes32 public override DOMAIN_SEPARATOR;
+    bytes32 public DOMAIN_SEPARATOR;
     // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
-    bytes32 public constant override PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
-    mapping(address => uint) public override nonces;
+    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
+    mapping(address => uint) public nonces;
 
     // event Approval(address indexed owner, address indexed spender, uint value);
     // event Transfer(address indexed from, address indexed to, uint value);
@@ -60,25 +60,25 @@ contract UniswapV2ERC20 is IUniswapV2ERC20 {
         emit Transfer(from, to, value);
     }
 
-    function approve(address spender, uint value) override external returns (bool) {
+    function approve(address spender, uint value) external returns (bool) {
         _approve(msg.sender, spender, value);
         return true;
     }
 
-    function transfer(address to, uint value) override external returns (bool) {
+    function transfer(address to, uint value) external returns (bool) {
         _transfer(msg.sender, to, value);
         return true;
     }
 
-    function transferFrom(address from, address to, uint value) override external returns (bool) {
+    function transferFrom(address from, address to, uint value) external returns (bool) {
         if (allowance[from][msg.sender] != uint(-1)) {
             allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
         }
         _transfer(from, to, value);
         return true;
     }
 
-    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) override external {
+    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
         require(deadline >= block.timestamp, 'UniswapV2: EXPIRED');
         bytes32 digest = keccak256(
             abi.encodePacked(