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-rw-r--r--actioncable/lib/action_cable.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actioncable/lib/action_cable.rb b/actioncable/lib/action_cable.rb
index c2d3550acb..8c274b130e 100644
--- a/actioncable/lib/action_cable.rb
+++ b/actioncable/lib/action_cable.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
#--
# Copyright (c) 2015-2017 Basecamp, LLC
#