title: Enclosed field key and field value with square brackets when create operation of laravel migration is performed
body: <p>I have field name key and value in my schema. When i perform migration command it enclose my fields key and value with square brackets in my sql table.The sample of fields created after migration in sql table is given below:</p>
  
  <p>[key]
  [value]</p>
  
  <pre><code>&lt;?php
  
  use Illuminate\Support\Facades\Schema;
  use Illuminate\Database\Schema\Blueprint;
  use Illuminate\Database\Migrations\Migration;
  
  class check extends Migration
  {
      /**
       * Run the migrations.
       *
       * @return void
       */
      public function up()
      {
          Schema::create('api_keys',function(Blueprint $table){
  
               $table-&gt;string('value',255)-&gt;comment = "Key Value";
               $table-&gt;integer('Level')-&gt;nullable()-&gt;comment = "Key Level";
  
          });
      }
  
      /**
       * Reverse the migrations.
       *
       * @return void
       */
      public function down()
      {
          Schema::dropIfExists('api_keys');
      }
  }
  </code></pre>
  
  <p>I have tried every possible solution but still cannot figured out the reason behind enclosing the fields <strong>"[key]" and "[value]" with square brackets</strong> inside my sql table.</p>