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-rw-r--r--lib/axlsx/drawing/bubble_series.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/axlsx/drawing/bubble_series.rb b/lib/axlsx/drawing/bubble_series.rb
index 78b44bf1..e44a3fd8 100644
--- a/lib/axlsx/drawing/bubble_series.rb
+++ b/lib/axlsx/drawing/bubble_series.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module Axlsx
# A BubbleSeries defines the x/y position and bubble size of data in the chart
# @note The recommended way to manage series is to use Chart#add_series