fix quotes

mfornaciari · mfornaciari · commit e9cd0f874388 · 2023-10-28T00:18:37.000-03:00
diff --git a/src/ruby/binary_tree.rb b/src/ruby/binary_tree.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'test/unit/assertions'
+require "test/unit/assertions"
 include Test::Unit::Assertions
 
 class BinaryTree
