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-rw-r--r--actioncable/lib/action_cable.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actioncable/lib/action_cable.rb b/actioncable/lib/action_cable.rb
index 9edd82e7b5..bd828b2d0f 100644
--- a/actioncable/lib/action_cable.rb
+++ b/actioncable/lib/action_cable.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
#--
# Copyright (c) 2015-2017 Basecamp, LLC
#