Mention some Laravel specific incompatibilities in the wiki

Originally posted over at dingo/api https://github.com/dingo/api/issues/655
I want to send a Pull Request, but I just want to make sure that it's fine

Hi,

I've been using dingo/api in many applications and I noticed that users of dingo/api might need to know about the following issues in the wiki (and maybe at least about their workarounds or a link to the github issue):
- Form Validation breaks routing - I know this is mentioned in the docs for Exceptions, but the solution is not. This might be the [solution](https://github.com/dingo/api/issues/584) (I tried it and it works)
- `withoutMiddleware` in tests returns 404 - This is something that can't be fixed, but I think it's worth noting. #571

This is the only thing mentioned in the [wiki page](https://github.com/dingo/api/wiki/Package-Incompatibilities)

> The API will generally work with all other packages, however, some Laravel specific packages may conflict with the API as it integrates itself heavily with the Laravel router to provide the needed functionality.

Let me know what you think!