add filter to log_file location

Hi,

I have a small feature request: please add a filter to the log_file location in the init() method of the Log class. This is usefull for developers who have a custom log file location. Example below:

public function init()
{
$this->log_file = apply_filters(‘wp-log-viewer-get-log-file-location’, WP_CONTENT_DIR . ‘/debug.log’);
}