message: Change number of parallel requests for the same vertex to 2.
diff: @@ -22,7 +22,7 @@ use crate::{
  use super::{HighwayMessage, ProtocolOutcomes, ACTION_ID_VERTEX};
  -const MAX_REQUESTS_FOR_VERTEX: usize = 10;
  +const MAX_REQUESTS_FOR_VERTEX: usize = 2;
  #[cfg(test)]
  mod tests;
  