add TODOs

Author: hrxi

validator/src/double_proposal.rs

@@ -35,6 +35,8 @@ pub struct DoubleProposalDetector {
 }
 
 impl DoubleProposalDetector {
+    // TODO: add network_id
+    // TODO: record one proposal per validator per height
     pub fn new(block_number: u32) -> DoubleProposalDetector {
         DoubleProposalDetector {
             block_number,

validator/src/macro.rs

@@ -145,6 +145,7 @@ where
                       signature: SchnorrSignature| {
                     if let Some(proof) = double_proposal_detector
                         .lock()
+                        // TODO: are these already verified here?
                         .observe_valid_proposal(address, proposal, signature)
                     {
                         on_double_proposal(proof);