Update specron readme mentions to hardhat.

Author: MoMannn

BUG_BOUNTY.md

@@ -79,7 +79,7 @@ How to win:
 
 - Be descriptive and detailed when describing your issue
 - Fix it — recommend a way to solve the problem
-- Include a [Specron test](https://specron.github.io/framework/) case that we can reproduce
+- Include a [Hardhat test](https://hardhat.org/) case that we can reproduce
 
 Rules for bounty sponsor:
 

README.md

@@ -2,7 +2,7 @@
 
 # ERC-721 Token — Reference Implementation
 
-This is the complete reference implementation of the [ERC-721](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md) non-fungible token standard for the Ethereum and Wanchain blockchains. This is an open-source project, complete with [Specron](https://specron.github.io/framework/) testing.
+This is the complete reference implementation of the [ERC-721](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md) non-fungible token standard for the Ethereum and Wanchain blockchains. This is an open-source project, complete with [Hardhat](https://hardhat.org/) testing.
 
 The purpose of this implementation is to provide a good starting point for anyone who wants to use and develop non-fungible tokens on the Ethereum and Wanchain blockchains. Instead of re-implementing the ERC-721 yourself you can use this code which has gone through multiple audits and we hope it will be extensively used by the community in the future.
 

src/tests/utils/address-utils.js

@@ -0,0 +1,23 @@
+const { expect } = require('chai');
+
+describe('address utils', function() {
+  let addressUtils, owner;
+
+  beforeEach(async () => {
+    const addressUtilsContract = await ethers.getContractFactory('AddressUtilsMock');
+    addressUtils = await addressUtilsContract.deploy();
+    [ owner ] = await ethers.getSigners();
+    await addressUtils.deployed();
+  });
+
+  it('correctly checks account', async function() {
+    expect(await addressUtils.isContract(owner.address)).to.equal(false);
+  });
+
+  it('correctly checks smart contract', async function() {
+    const contract = await ethers.getContractFactory('NFTokenTestMock');
+    const nfToken = await contract.deploy();
+    await nfToken.deployed();
+    expect(await addressUtils.isContract(nfToken.address)).to.equal(true);
+  });
+});