Fix year for ZF2015-01
Fix year for ZF2015-01

FriendsOfSilverStripe/security-advisories,Ocramius/security-advisories,xabbuh/security-advisories,FriendsOfPHP/security-advisories,kdambekalns/security-advisories,weierophinney/security-advisories,BCyberSavvy/PHP,markstory/security-advisories,marcomenzel/security-advisories,jeskew/security-advisories