Bold the file created from the build-flag command

Test: manual
Bug: none
Change-Id: Ie402ab9fcfa046797439f3d8d128cb319aaca12e
diff --git a/cmd/release_config/build_flag/main.go b/cmd/release_config/build_flag/main.go
index 5d183ee..46efce7 100644
--- a/cmd/release_config/build_flag/main.go
+++ b/cmd/release_config/build_flag/main.go
@@ -329,7 +329,7 @@
 		return err
 	}
 	updatedFiles = append(updatedFiles, flagPath)
-	fmt.Printf("Added/Updated: %s\n", strings.Join(updatedFiles, " "))
+	fmt.Printf("\033[1mAdded/Updated: %s\033[0m\n", strings.Join(updatedFiles, " "))
 	return nil
 }