added test hash to reviewer email subject line

app/mailers/reviewer_mailer.rb

@@ -4,6 +4,6 @@ class ReviewerMailer < ApplicationMailer
     @candidate = candidate
     recipients = candidate.quiz.reviewers.map(&:email)
 
-    mail to: recipients, subject: "Skills Assessment Results"
+    mail to: recipients, subject: "Skills Assessment Results - #{@candidate.test_hash}"
   end
 end