updated VRF library to solidity 0.8.x

benchmark/VRFGasHelper.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity 0.6.12;
+pragma solidity ^0.8.0;
 
 import "../contracts/VRF.sol";
 

contracts/Migrations.sol

@@ -1,12 +1,12 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.4.21 <0.7.0;
+pragma solidity ^0.8.0;
 
 contract Migrations {
   address public owner;
   uint public last_completed_migration;
 
-  constructor() public {
+  constructor() {
     owner = msg.sender;
   }
 

contracts/VRF.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.5.3 <0.7.0;
+pragma solidity ^0.8.0;
 
 import "elliptic-curve-solidity/contracts/EllipticCurve.sol";
 
@@ -452,6 +452,6 @@ library VRF {
   function pointToAddress(uint256 _x, uint256 _y)
       internal pure returns(address)
   {
-    return address(uint256(keccak256(abi.encodePacked(_x, _y))) & 0x00FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
+    return address(uint160(uint256(keccak256(abi.encodePacked(_x, _y)))));
   }
 }

package.json

@@ -48,7 +48,7 @@
     "ganache-cli": "6.12.1",
     "solidity-coverage": "0.7.12",
     "solium": "1.2.5",
-    "truffle": "5.1.53",
+    "truffle": "^5.11.5",
     "truffle-assertions": "0.9.2"
   }
 }

test/TestHelperInternals.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity 0.6.12;
+pragma solidity ^0.8.0;
 
 import "../contracts/VRF.sol";
 

test/TestHelperVRF.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity 0.6.12;
+pragma solidity ^0.8.0;
 
 import "../contracts/VRF.sol";
 

truffle-config.js

@@ -25,7 +25,7 @@ module.exports = {
   },
   compilers: {
     solc: {
-      version: "0.6.12",
+      version: "^0.8.0",
       settings: {
         optimizer: {
           enabled: true,