message: No need to use custom encoder
diff: @@ -167,7 +167,7 @@ impl AuthCodePkceSpotify {
  hasher.update(verifier.as_bytes());
  let challenge = hasher.finalize();
  - let challenge = base64::encode_config(challenge, base64::URL_SAFE_NO_PAD);
  + let challenge = base64::encode(challenge);
  (verifier, challenge)
  }
  