Bump factory_girl_rails from 4.5.0 to 4.8.0
Bump factory_girl_rails from 4.5.0 to 4.8.0

Bumps [factory_girl_rails](https://github.com/thoughtbot/factory_girl_rails) from 4.5.0 to 4.8.0.
- [Changelog](https://github.com/thoughtbot/factory_girl_rails/blob/master/NEWS)
- [Commits](https://github.com/thoughtbot/factory_girl_rails/compare/v4.5.0...v4.8.0)
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