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-rw-r--r--lib/rss/maker/trackback.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rss/maker/trackback.rb b/lib/rss/maker/trackback.rb
index 00f001cb85..f97691c608 100644
--- a/lib/rss/maker/trackback.rb
+++ b/lib/rss/maker/trackback.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'rss/trackback'
require 'rss/maker/1.0'
require 'rss/maker/2.0'