add breaking change doc

sourcenetwork · Feb 16, 2023 · b76fb06 · b76fb06
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+# Updating the `github.com/ugorji/go/codec` package changes CIDs
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+Updating of github.com/ugorji/go/codec going from `1.1.7` to `1.2.9` change the way the encoder behaves with the same input. This causes the input to the CID generation function to be different and thus the resulting CID is different.