Default locations to `query` for GET calls

I was using:
```python
@use_kwargs({'refs': fields.Str(required=True)})
def get(self, refs):
```
And in the swagger UI the place to enter this came up as "Body". and when I tried using this, it gave me an error saying:
`TypeError: Failed to execute 'fetch' on 'Window': Request with GET/HEAD method cannot have body.`

Then I realized I had to do:
```python
@use_kwargs({'refs': fields.Str(required=True)}, locations=('query',))
def get(self, refs):
```

For get requests, it would be nice if the default value for GET requests could be set to something that doesn't error out as this was a fair bit confusing ...