### New features

* [#197](https://github.com/rubocop/rubocop-rails/pull/197): Add `Rails/UniqueValidationWithoutIndex` cop. ([@pocke][])
* [#208](https://github.com/rubocop/rubocop-rails/pull/208): Add new `Rails/IndexBy` and `Rails/IndexWith` cops. ([@djudd][], [@eugeneius][])
* [#150](https://github.com/rubocop/rubocop-rails/issues/150): Add `EnforcedStyle: refute` for `Rails/RefuteMethods` cop. ([@koic][])

### Bug fixes

* [#180](https://github.com/rubocop/rubocop-rails/issues/180): Fix a false positive for `HttpPositionalArguments` when using `get` method with `:to` option. ([@koic][])
* [#193](https://github.com/rubocop/rubocop-rails/issues/193): Make `Rails/EnvironmentComparison` aware of `Rails.env` is used in RHS or when `!=` is used for comparison. ([@koic][])
* [#205](https://github.com/rubocop/rubocop-rails/pull/205): Make `Rails/ReversibleMigration` aware of `:to_table` option of `remove_foreign_key`. ([@joshpencheon][])
* [#207](https://github.com/rubocop/rubocop-rails/pull/207): Fix a false positive for `Rails/RakeEnvironment` when using Capistrano. ([@sinsoku][])

[@pocke]: https://github.com/pocke
[@djudd]: https://github.com/djudd
[@eugeneius]: https://github.com/eugeneius
[@koic]: https://github.com/koic
[@joshpencheon]: https://github.com/joshpencheon
[@sinsoku]: https://github.com/sinsoku
