v0.3.0

This can be considered the first version that is ready for evaluation in production-like environments.

Changelog:

• The method HiddenSloth#decryptFromStorageWithCachedSecrets now correctly throws SlothDecryptionFailed instead of AEADBadTagException if decryption fails.
• Removed obsolete code from HiddenSlothImpl#computeCachedSecrets
• Upgraded dependencies