message: transport: remove a "dyn" in Error impl
  not sure why is was there, but doesn't seem to be needed.
diff: @@ -106,7 +106,7 @@ impl From<neqo_common::Error> for Error {
  }
  impl ::std::error::Error for Error {
  - fn source(&self) -> Option<&(dyn ::std::error::Error + 'static)> {
  + fn source(&self) -> Option<&(::std::error::Error + 'static)> {
  match self {
  Error::CryptoError(e) => Some(e),
  Error::IoError(e) => Some(e),
  