0.4.1: JRuby tweaks and re-describing the gem

Changed

• Refactor verification on JRuby to avoid parsing encoded hashes unnecessarily
• No longer describe the gem in terms of bindings to the reference C implementation given the Bouncy Castle-based JRuby implementation
• Only wrap IllegalStateException with Argon2id::Error on JRuby

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SHA256 checksums:

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