Update library/Zend/Validator/Hostname.php

[EdpSuperluminal](https://github.com/EvanDotPro/EdpSuperluminal) fails due to faulty path.

Warning: include(Hostname/Com.php): failed to open stream: No such file or directory in /path/to/application/data/cache/classes.php.cache on line 2
Warning: include(): Failed opening 'Hostname/Com.php' for inclusion (include_path='.:/usr/local/share/pear') in /path/to/application/data/cache/classes.php.cache on line 2
Fatal error: Unsupported operand types in /path/to/application/data/cache/classes.php.cache on line 2