README: dev dependencies: add gci

it's used in the Makefile but, prior to this, the README didn't instruct you to install it.
flashbots · Sep 19, 2024 · 3554fed · 3554fed
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diff --git a/README.md b/README.md
@@ -45,6 +45,7 @@ go install mvdan.cc/gofumpt@v0.4.0
 go install honnef.co/go/tools/cmd/staticcheck@v0.4.2
 go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.60.3
 go install go.uber.org/nilaway/cmd/nilaway@v0.0.0-20240821220108-c91e71c080b7
+go install github.com/daixiang0/gci@v0.11.2
 ```
 
 **Lint, test, format**