public function up()
{
Schema::create('role_user', function (Blueprint $table) {
$table->increments('id');
$table->integer('role_id')->unsigned();
$table->foreign('role_id')->references('id')->on('roles');
$table->integer('user_id')->unsigned();
$table->foreign('user_id')->references('id')->on('users');
$table->timestamps();
});
}