v3.1.6

Fixes #3589 - Remove domNode from deepExtend

Add support for requestInterceptor / responseInterceptor.

- Display mutated requests from request interceptor in curl output in UI.
  Put this behind showMutatedRequest flag so that the mutation can be
  silent.
- Document requestInterceptor, responseInterceptor and showMutatedRequest
  in README.md
- Add tests

v3.1.5

Introduce React.Perf in all non-production builds.

Added href attribute to <use> tags with deprecated xlinkHref attribute.

Display OAS3 parameter types

Changed radius on input in topbar

Add CONTRIBUTING.md

Filter writeOnly fields in relevant places

Fix cURL outputs with formData

I couldn't find any instances of body being an array when testing
formData with real specs... I think this was a mistake.

Fix global state issues with Schemes component