'php artisan panel:install' should check the schema

[Anton-V-K]

Migration scripts should check the DB schema, before trying to make changes.
For instance, if Spatie is installed, the DB already contains roles table.
And installation fails:

Migrating: 2015_03_15_123956_edit_url_table
Migrated:  2015_03_15_123956_edit_url_table
Migrating: 2016_02_10_181651_create_roles_tables

   Illuminate\Database\QueryException  : SQLSTATE[42S01]: Base table or view already exists: 1050
 Table 'roles' already exists (SQL: create table `roles` (`id` int unsigned not null auto_increment primary
 key, `name` varchar(255) not null, `label` varchar(255) null, `created_at` timestamp null, `updated_at`
 timestamp null) default character set utf8mb4 collate 'utf8mb4_unicode_ci')

Please, update the instruction. It contains the broken link https://github.com/docs/master/crud-commands .