Supplemental instructions to complement CHANGELOG.md.
In version 3.4.0, the default crypto_provider was changed from Sha512 to SCrypt.
If you never set a crypto_provider and are upgrading, your passwords will break unless you set the original:
c.crypto_provider = Authlogic::CryptoProviders::Sha512
And if you want to automatically upgrade from Sha512 to SCrypt as users login:
c.transition_from_crypto_providers = [Authlogic::CryptoProviders::Sha512]
c.crypto_provider = Authlogic::CryptoProviders::SCrypt