add aead robustness as recommend by libsodium docs #97
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To avoid anyone using Secsync to suffer from "Message Franking" https://eprint.iacr.org/2019/016.pdf we add proper AEAD robusntess by default as recommended by Libsodium here https://libsodium.gitbook.io/doc/secret-key_cryptography/aead#robustness