message: Remove deprecated `.description()` use in pnet_base
diff: @@ -174,7 +174,9 @@ pub enum ParseMacAddrErr {
  InvalidComponent,
  }
  -impl Error for ParseMacAddrErr {
  +impl Error for ParseMacAddrErr {}
  +
  +impl ParseMacAddrErr {
  fn description(&self) -> &str {
  match *self {
  ParseMacAddrErr::TooManyComponents => "Too many components in a MAC address string",
  