Update README.md (#1206)

rename Hyperledger Besu to Besu

README.md

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 # Linea tracer (zkEVM)
 
 This repository hosts a Linea tracing implementation for 
-[Hyperledger Besu](https://github.com/hyperledger/besu) based on an 
+[Besu](https://github.com/hyperledger/besu) based on an 
  implementation in Go.
 
 Tracing refers to the process of extracting data from the execution of an EVM client in order to construct large matrices known as execution traces. Execution traces are subject to the constraint system specified in the [linea-specification](https://github.com/Consensys/linea-specification) repo and implemented in the [linea-constraints](https://github.com/Consensys/linea-constraints) repo.