ERC20準拠のトークン作成の際にやるtruffleのテストが実行できません

前提・実現したいこと

https://github.com/OpenZeppelin/openzeppelin-contracts
上記のOpenZeppelinに準拠したトークンを作成したい

発生している問題・エラーメッセージ

ブロックチェーンアプリケーション開発の教科書という本と
こちらのサイトと　http://kojiryo.com/968/　こちらのhttps://qiita.com/yanyansk/items/eb4f71a16302c321e16d　参考に
トークンを作成していったところ下記のようにtruffleのバージョンと
solidityとtruffleバージョンが合わないみたいなエラーメッセージが出てきたので

truffle(develop)> test

Compiling your contracts...
===========================
> Compiling .\contracts\DappsToken.sol
> Compiling .\contracts\Migrations.sol
> Compiling openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

openzeppelin-solidity/contracts/token/ERC20/ERC20.sol:3:1: ParserError: Source file requires different compiler version (current compiler is 0.5.16+commit.9c3226ce.Emscripten.clang - note that nightly builds are considered to be strictly less than the released version
pragma solidity ^0.6.0;
^---------------------^

Error: Truffle is currently using solc 0.5.16, but one or more of your contracts specify "pragma solidity ^0.6.0".
Please update your truffle config or pragma statement(s).
(See https://truffleframework.com/docs/truffle/reference/configuration#compiler-configuration for information on
configuring Truffle to use a specific solc compiler version.)

Compilation failed. See above.
truffle(develop)>

該当のソースコード

solidity
1pragma solidity ^0.5.0;
2import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
3
4contract DappsToken is ERC20 
5{
6  string public name = "DappsToken";
7  string public symbol = "DTKN";
8  uint public decimals = 18;
9
10  constructor(uint initialSupply) public 
11  {
12    _mint(msg.sender, initialSupply);
13  }
14
15}

試したこと

トークンコントラクトを下記のように変え

solidity
1pragma solidity ^0.6.0;
2import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
3
4contract DappsToken is ERC20 
5{
6  string public _name = "DappsToken";
7  string public _symbol = "DTKN";
8  uint public _decimals = 18;
9
10  constructor(uint initialSupply) public 
11  {
12    _mint(msg.sender, initialSupply);
13  }
14
15}

truffleのコンフィグを下記のように変えましたが

javascript
1  compilers: 
2  {
3    solc: 
4    {
5      version: "0.6.0",    // Fetch exact version from solc-bin (default: truffle's version)
6      docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
7      parser: "solcjs",
8      settings: 
9      {          // See the solidity docs for advice about optimization and evmVersion
10        optimizer: 
11        {
12          enabled: true,
13          runs: 200
14        },
15        evmVersion: "byzantium"
16       }
17    }
18  }

また似たようなエラーが出てしまいました。

truffle(develop)> test

Compiling your contracts...
===========================
> Compiling .\contracts\DappsToken.sol
> Compiling .\contracts\Migrations.sol

/C/Users/doria/dapps-token/contracts/DappsToken.sol:1:1: ParserError: Source file requires different compiler version (current compiler is 0.5.16+commit.9c3226ce.Emscripten.clang - note that nightly builds are considered to be strictly less than the released version
pragma solidity ^0.6.0;
^---------------------^

Error: Truffle is currently using solc 0.5.16, but one or more of your contracts specify "pragma solidity ^0.6.0".
Please update your truffle config or pragma statement(s).
(See https://truffleframework.com/docs/truffle/reference/configuration#compiler-configuration for information on
configuring Truffle to use a specific solc compiler version.)

Compilation failed. See above.