laravel54初始化迁移失败

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[Illuminate\Database\QueryException]
 SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was t
 oo long; max key length is 767 bytes (SQL: alter table `users` add unique `
 users_email_unique`(`email`))

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php artisan make:auth
php artisan migrate

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use Illuminate\Support\Facades\Schema;

function boot()
{
    Schema::defaultStringLength(191);
}