Fix json tag

election/ballot.go

@@ -26,7 +26,7 @@ import (
 // Ballot represents a share to be submitted to a vote counter.
 type Ballot struct {
 	ID        uuid.UUID       `json:"id"`
-	Timestamp time.Time       `json:"timestamp`
+	Timestamp time.Time       `json:"timestamp"`
 	Share     *pedersen.Share `json:"share"`
 	Commits   pedersen.Proof  `json:"commits"`
 	Proofs    [2]*sigma.Proof `json:"proofs"`