Inconsistency in IIdentity file

[marabucz]

Version: 3.1.0-3.1.3

Bug Description

IIdentity claims to have a method getData() (https://github.com/nette/security/blob/v3.1.3/src/Security/IIdentity.php#L15), but the method itself is being commented. Result is PHPStorm is constantly complaining about getData not being overwritten.