Cannot create html file with Basic authorization

In case of enabling Basic Authorization in the web site, StaticPress cannot generate html files even if I set up the basic optional setting.

I resolved the issue by fixing includes/class-static_press_admin.php, but please fix the code.

fixed code.

	static public function basic_auth(){
//		return get_option(self::OPTION_STATIC_BASIC, false);
		return 'BASE64 encoding (id:pass for Basic Authorization)';
	}