added zendframework/zend-cache into Zend\XmlRpc's composer.json to support Zend\\XmlRpc\\Server\\Cache usage
added zendframework/zend-cache into Zend\XmlRpc's composer.json
to support Zend\\XmlRpc\\Server\\Cache usage

zendframework/zend-xmlrpc,samsonasik/zend-xmlrpc,MadCat34/zend-xmlrpc