Fix a false positive for Performance/Sum
#321
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This PR fixes a false positive for `Performance/Sum` when using `TargetRubyVersion` is 2.3 or lower. Because `Array#sum` was introduced in Ruby 2.4.
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This PR fixes a false positive for
Performance/Sumwhen usingTargetRubyVersionis 2.3 or lower.Because
Array#sumwas introduced in Ruby 2.4.Before submitting the PR make sure the following are checked:
[Fix #issue-number](if the related issue exists).master(if not - rebase it).bundle exec rake default. It executes all tests and runs RuboCop on its own code.{change_type}_{change_description}.mdif the new code introduces user-observable changes. See changelog entry format for details.