title: laravel 5.6.4 authentication with "tymon/jwt-auth" is not working
body: <p>I was trying to install tymon/jwt-auth with laravel 5.6.4 using composer </p>
  
  <p>composer require tymon/jwt-auth </p>
  
  <p>but it is showing some error like this: </p>
  
  <pre><code>Using version ^0.5.12 for tymon/jwt-auth
  ./composer.json has been updated
  Loading composer repositories with package information
  Updating dependencies (including require-dev)
  Your requirements could not be resolved to an installable set of packages.
  
  Problem 1
  - Conclusion: don't install barryvdh/laravel-cors v0.8.6
  - Conclusion: don't install barryvdh/laravel-cors v0.8.5
  - Conclusion: don't install barryvdh/laravel-cors V0.8.4
  - Conclusion: don't install barryvdh/laravel-cors v0.8.3
  - Conclusion: remove laravel/framework v5.6.3
  - Installation request for barryvdh/laravel-cors ^0.8.2 -&gt; satisfiable by barryvdh/laravel-cors[V0.8.4, v0.8.2, v0.8.3, v0.8.5, v0.8.6].
  - Conclusion: don't install laravel/framework v5.6.3
  - barryvdh/laravel-cors v0.8.2 requires illuminate/support 5.1.x|5.2.x|5.3.x -&gt; satisfiable by illuminate/support[5.1.x-dev, 5.2.x-dev, 5.3.x-dev, v5.1.1, v5.1.13, v5.1.16, v5.1.2, v5.1.20, v5.1.22, v5.1.25, v5.1.28, v5.1.30, v5.1.31, v5.1.41, v5.1.6, v5.1.8, v5.2.0, v5.2.19, v5.2.21, v5.2.24, v5.2.25, v5.2.26, v5.2.27, v5.2.28, v5.2.31, v5.2.32, v5.2.37, v5.2.43, v5.2.45, v5.2.6, v5.2.7, v5.3.0, v5.3.16, v5.3.23, v5.3.4].
  - don't install illuminate/support 5.1.x-dev|don't install laravel/framework v5.6.3
  - don't install illuminate/support 5.2.x-dev|don't install laravel/framework v5.6.3
  - don't install illuminate/support 5.3.x-dev|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.1|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.13|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.16|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.2|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.20|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.22|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.25|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.28|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.30|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.31|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.41|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.6|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.1.8|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.0|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.19|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.21|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.24|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.25|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.26|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.27|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.28|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.31|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.32|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.37|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.43|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.45|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.6|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.2.7|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.3.0|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.3.16|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.3.23|don't install laravel/framework v5.6.3
  - don't install illuminate/support v5.3.4|don't install laravel/framework v5.6.3
  - Installation request for laravel/framework (locked at v5.6.3, required as 5.6.*) -&gt; satisfiable by laravel/framework[v5.6.3].
  </code></pre>
  
  <p>Installation failed, reverting ./composer.json to its original content.</p>
  
  <p><strong>Update:</strong> </p>
  
  <p>Firstly I was trying <code>composer update</code> command adding some specific version of dependencies in composer.json file. Like <code>"tymon/jwt-auth": "0.5.*"</code> and <code>"barryvdh/laravel-cors": "^0.8.2"</code>.</p>
  
  <p>After that I was trying <code>composer require tymon/jwt-auth</code> not removing the lines with specific version of <code>tymon/jwt-auth</code> and <code>barryvdh/laravel-cors</code>.
   After removing the lines from composer.json file with specific versions of <code>tymon/jwt-auth</code> the </p>
  
  <pre><code>composer require tymon/jwt-auth  
  </code></pre>
  
  <p>command is working fine.</p>
  
  <p>Thanks</p>