RuboCop Rails 2.8.1

Bug fixes

• #345: Fix error of Rails/AfterCommitOverride on after_commit with a lambda. (@pocke)
• #349: Fix errors of Rails/UniqueValidationWithoutIndex. (@Tietew)
• #338: Fix a false positive for Rails/IndexBy and Rails/IndexWith when the each_with_object hash is used in the transformed key or value. (@eugeneius)
• #351: Add <> operator to Rails/WhereNot cop. (@Tietew)
• #352: Do not register offense if given a splatted hash. (@dvandersluis)
• #346: Fix a false positive for Rails/DynamicFindBy when any of the arguments are splat argument. (@koic)
• #357: Fix a false positive for Rails/ReversibleMigration when keyword arguments of change_column_default are in the order of to, from. (@koic)