RuboCop Rails 2.21.2

Bug fixes

• #1126: Fix a false positive for Rails/RedundantActiveRecordAllMethod when using some Enumerable's methods with block argument. (@koic)
• #1121: Fix an error for Rails/SelectMap when using select(:column_name).map(&:column_name) without receiver model. (@koic)
• #1119: Fix an incorrect autocorrect for Rails/RedundantActiveRecordAllMethod when all has parentheses. (@masato-bkn)
• #1130: Fix crash for Rails/UniqueValidationWithoutIndex with bare validate. (@jamiemccarthy)
• #1124: Fix false positives for Rails/RedundantActiveRecordAllMethod when receiver is not an Active Record model. (@koic)