Log Message:
misc/ruby-hashie: update to 3.5.7

## [3.5.7] - 2017-12-19

[3.5.7]: https://github.com/intridea/hashie/compare/v3.5.6...v3.5.7

### Fixed

[#430](https://github.com/intridea/hashie/pull/430): Fix Hashie::Rash randomly \ 
losing items - [@Antti](https://github.com/Antti)

### Miscellaneous

* [#425](https://github.com/intridea/hashie/pull/425): Update rubies in CI - \ 
[@kachick](https://github.com/kachick).