add application key to submitters

app/models/submitter.rb

@@ -4,21 +4,22 @@
 #
 # Table name: submitters
 #
-#  id            :bigint           not null, primary key
-#  completed_at  :datetime
-#  email         :string
-#  ip            :string
-#  name          :string
-#  opened_at     :datetime
-#  phone         :string
-#  sent_at       :datetime
-#  slug          :string           not null
-#  ua            :string
-#  uuid          :string           not null
-#  values        :text             not null
-#  created_at    :datetime         not null
-#  updated_at    :datetime         not null
-#  submission_id :bigint           not null
+#  id              :bigint           not null, primary key
+#  application_key :string
+#  completed_at    :datetime
+#  email           :string
+#  ip              :string
+#  name            :string
+#  opened_at       :datetime
+#  phone           :string
+#  sent_at         :datetime
+#  slug            :string           not null
+#  ua              :string
+#  uuid            :string           not null
+#  values          :text             not null
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#  submission_id   :bigint           not null
 #
 # Indexes
 #