Update docs

test/token/ERC20/extensions/ERC20Burnable.test.js

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+const { BN } = require('@openzeppelin/test-helpers');
+
+const { shouldBehaveLikeERC20Burnable } = require('./ERC20Burnable.behavior');
+const ERC20BurnableMock = artifacts.require('ERC20BurnableMock');
+
+contract('ERC20Burnable', function (accounts) {
+  const [ owner, ...otherAccounts ] = accounts;
+
+  const initialBalance = new BN(1000);
+
+  const name = 'My Token';
+  const symbol = 'MTKN';
+
+  beforeEach(async function () {
+    this.token = await ERC20BurnableMock.new(name, symbol, owner, initialBalance, { from: owner });
+  });
+
+  shouldBehaveLikeERC20Burnable(owner, initialBalance, otherAccounts);
+});