Fix some warnings.

models/judgment.go

@@ -120,7 +120,7 @@ func getJudgmentOfJudgeOnPollCandidate(e Engine, judgeID int64, pollID int64, ca
 		And("`judgment`.candidate_id = ?", candidateID).
 		Limit(1).
 		Find(&judgmentsIds); err != nil {
-		return nil, fmt.Errorf("Find Judgment: %v", err)
+		return nil, fmt.Errorf("find judgment: %v", err)
 	}
 
 	if 0 == len(judgmentsIds) {

routers/repo/poll_judgment.go

@@ -61,7 +61,7 @@ func EmitJudgment(ctx *context.Context) {
 			_, errU := models.UpdateJudgment(&models.UpdateJudgmentOptions{
 				Poll:        poll,
 				Judge:       judge,
-				Grade:       int8(grade),
+				Grade:       grade,
 				CandidateID: candidateID,
 			})
 			if nil != errU {
@@ -78,7 +78,7 @@ func EmitJudgment(ctx *context.Context) {
 		_, errC := models.CreateJudgment(&models.CreateJudgmentOptions{
 			Poll:        poll,
 			Judge:       judge,
-			Grade:       int8(grade),
+			Grade:       grade,
 			CandidateID: candidateID,
 		})
 		if nil != errC {