Hide replace flag from help output

* Replace flag is a "not recommended for use" flag, and is mainly
present to be used with software that is using sqlboiler as a library,
such as abcweb

main.go

@@ -14,7 +14,7 @@ import (
 	"github.com/vattle/sqlboiler/boilingcore"
 )
 
-const sqlBoilerVersion = "2.1.8"
+const sqlBoilerVersion = "2.1.9"
 
 var (
 	cmdState  *boilingcore.State
@@ -88,6 +88,9 @@ func main() {
 	rootCmd.PersistentFlags().BoolP("tinyint-as-bool", "", false, "Map MySQL tinyint(1) in Go to bool instead of int8")
 	rootCmd.PersistentFlags().BoolP("wipe", "", false, "Delete the output folder (rm -rf) before generation to ensure sanity")
 
+	// hide flags not recommended for use
+	rootCmd.PersistentFlags().MarkHidden("replace")
+
 	viper.SetDefault("postgres.sslmode", "require")
 	viper.SetDefault("postgres.port", "5432")
 	viper.SetDefault("mysql.sslmode", "true")