message: cbor_event::de: Add a function for deserializing Booleans
  This is needed because types::Special is not public.
diff: @@ -542,6 +542,10 @@ impl<'a> RawCbor<'a> {
  }
  }
  + pub fn bool(&mut self) -> Result<bool> {
  + self.special()?.unwrap_bool()
  + }
  +
  pub fn deserialize<T>(&mut self) -> Result<T>
  where T: Deserialize
  {
  