Do not log zaddrs or txids to reduce metadata leakage on disk

lib/build.rs

@@ -1,3 +1,5 @@
+// Copyright The Hush Developers  2019-2022
+// Released under the GPLv3
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     tonic_build::configure()
          .build_server(false)
@@ -8,4 +10,4 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     println!("cargo:rerun-if-changed=proto/service.proto");
     Ok(())
  }
- 
+