[Fix #70] Fix a false negative for Performance/FlatMap
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Fixes rubocop#70. This PR fixes a false negative for `Performance/FlatMap` when using symbol to proc operator argument of `map` method.
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Fixes #70.
This PR fixes a false negative for
Performance/FlatMapwhen using symbol to proc operator argument ofmapmethod.@splattael I write your account both credit in the changelog. Thanks!
Before submitting the PR make sure the following are checked:
[Fix #issue-number](if the related issue exists).master(if not - rebase it).and description in grammatically correct, complete sentences.
bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.