headers are overwritten

Hello,
I've updated to the latest version and this 
`{ headers: { Accept: 'application/json' } },`
 removes the globally added headers

```
const result = await $axios.get(
        `${env.api}/products/${route.params.slug}`,
        { headers: { Accept: 'application/json' } },
        {
          params: {
            showOther: true,
          },
        },
      );
```