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-rw-r--r--app/mailers/notification_mailer.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/app/mailers/notification_mailer.rb b/app/mailers/notification_mailer.rb
index 6c81df269..2ed562979 100644
--- a/app/mailers/notification_mailer.rb
+++ b/app/mailers/notification_mailer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class NotificationMailer < ApplicationMailer
   helper StreamEntriesHelper