Support new instance_variables_to_inspect method from Ruby core #49
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This supports the new
instance_variables_to_inspectmethod from Ruby core that was added in ruby/ruby#13555.If
instance_variables_to_inspectis defined, thenpretty_print_instance_variableswill use it.Additionally, this commit introduces tests for both
pretty_print_instance_variablesandinstance_variables_to_inspect.