hide_format not working with grape 0.12.0

```
gem 'grape', '0.12.0'
gem 'grape-swagger', '0.10.1'
gem 'grape-swagger-rails', :git => 'git://github.com/BrandyMint/grape-swagger-rails.git'
```

`.(format)`is added to the url even if `hide_format` is set to `true`.
