start encoding candidate emails - completes #57

app/models/candidate.rb

@@ -4,6 +4,8 @@ class Candidate < ApplicationRecord
   has_many :answers
   belongs_to :recruiter, class_name: "User"
 
+  serialize :email, CryptSerializer
+
   before_validation(:generate_test_hash, on: :create)
 
   validates_presence_of :recruiter_id