0.4.0: JRuby support

Added

• Added support for JRuby 9.4 by adding an implementation of Argon2id hashing and verification using JRuby-OpenSSL's Bouncy Castle internals.
• Added output to Argon2id::Password instances so the actual "output" part of a password hash can be retrieved (and compared)

Changed

• Verifying a password will now consistently raise an ArgumentError when given an invalid encoded hash rather than an Argon2id::Error

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SHA256 checksums:

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