fix: do not print private key in log (#12)

README.md

@@ -23,8 +23,10 @@ For the details of mev_params, here are some notices:
 1. `make build`
 2. `.build/sentry -config ./configs/config.toml`
 
-Sentry settings are configured in the `config.toml` file. The following is an example of a `config.toml` file:
+❗❗❗This is an important security notice: Please do not configure any validator's private key here. 
+Please create entirely new accounts as pay bid accounts.
 
+config-example.toml:
 ```
 [Service]
 HTTPListenAddr = "localhost:8555" # The address to listen on for HTTP requests.

cmd/main.go

@@ -37,7 +37,8 @@ func main() {
 
 	openPrometheusAndPprof(cfg.Debug.ListenAddr)
 
-	log.Infow("bsc mev-sentry start", "configPath", *configPath, "config", cfg)
+	log.Infow("bsc mev-sentry start", "configPath", *configPath,
+		"validator_count", len(cfg.Validators), "builder_count", len(cfg.Builders))
 
 	validators := make(map[string]node.Validator)
 	for _, v := range cfg.Validators {