v0.4.0-rc.2

• Fix signature counter to improve spec compliance:
  • Set the initial signature counter to 1.
  • Correctly handle signature counter overflows by returning 0.
  • Increment the signature counter by a positive random number per assertion.
• Add the Config::new method to create an instance with the default values.
• Add support for multiple credential ID versions and add the credential_id_version field to Config.
• Add CredentialIdVersion::V2 using AES-256-GCM.
• Make firmware version configurable depending on the current credential ID format.