Middleware URL does not accept http://localhost:3002/ only accepts http://localhost:3002

All mocks were served correctly as I was able to see the proper response at `http://localhost:3002/parrot/scenario`; however, Parrot Devtools was showing me the error message: 
```
Failed to Load Scenarios
Try refreshing or updating the middleware URL in settings.
```
The middleware URL should be able to accept `http://localhost:3002/` and `http://localhost:3002` as acceptable URLs. 