update README.md

Author: eddyv

README.md

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 Schema Registry Transfer SMT
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 A [Kafka Connect Single Message Transformation (SMT)][smt] that reads the serialized [wire format header][wire-format] of Confluent's `KafkaAvroSerializer`, performs a lookup against a source [Confluent Schema Registry][schema-registry] for the ID in the message, and registers that schema into a destination Registry for that topic/subject under a new ID.