https://laracasts.com/discuss/channels/laravel/add-new-column-to-existing-table
php artisan make:migration add_project_id_to_permissions_table --table=permissions
<?php
Schema::table('permissions', function(Blueprint $table) {
// To add column order:
$table->string('title')->after('your-column-name');
$table->integer('project_id')->unsigned(); // add this line
});