Added support for postgres --exclude-table-data option

Added support for postgres ```--exclude-table-data``` option to skip data from certain tables during backup. 

Just declare list of tables in ```postgres.exclude_table_data``` config directive:

```php
return [
    'path' => storage_path('dumps'),
	'postgres' => [
		'exclude_table_data' => [
			'api_requests_log',
			'autologin_tokens',
			'cache',
			'carwash_statistic_log',
			'carwashes_index',
			'failed_jobs',
			'password_reminders',
			'sessions',
		],
	],
];
```

Why did you add a whitespace here? Am I missing something?