### Bug fixes

* [#164](https://github.com/rubocop/rubocop-performance/pull/164): Fix an error for `Performance/CollectionLiteralInLoop` when a method from `Enumerable` is called with no receiver. ([@eugeneius][])
* [#165](https://github.com/rubocop/rubocop-performance/issues/165): Fix a false positive for `Performance/Sum` when using initial value argument is a variable. ([@koic][])

### Changes

* [#163](https://github.com/rubocop/rubocop-performance/pull/163): Change `Performance/Detect` to also detect offenses when index 0 or -1 is used instead (ie. `detect{ ... }[0]`). ([@dvandersluis][])
* [#168](https://github.com/rubocop/rubocop-performance/pull/168): Extend `Performance/Sum` to register an offense for `inject(&:+)`. ([@eugeneius][])

[@eugeneius]: https://github.com/eugeneius
[@koic]: https://github.com/koic
[@dvandersluis]: https://github.com/dvandersluis
