update readme

geth-utils/README.md

@@ -2,19 +2,6 @@
 
 The module `gethutil` tried to provide identical output from APIs `debug_trace*` of latest `geth` as test vectors for [`zkevm-circuits`](https://github.com/privacy-scaling-explorations/zkevm-circuits).
 
-## Usage
-
-<!-- ### CLI Usage -->
-<!-- TODO: Implement a CLI to consume bytecode and output logs -->
-
-### Library Usage
-
-For [`./example/mstore_mload.go`](./example/mstore_mload.go) as an example, it defines bytecode directly by builder `asm`, then write the logs produced by `TraceTx` to stdout. To reproduce the logs, run:
-
-```bash
-go run ./example/mstore_mload.go > ./mstore_mload.json
-```
-
 ### Debugging
 
 The execution traces returned by geth omit some information like execution