- By default, viewport addon is reading both initial viewports' set and default viewport from
`INITIAL_VIEWPORTS` and `DEFAULT_VIEWPORT` respectively which are exported by the addon
- `configure` function is exported which accepts an object with `defaultViewport` and `viewports`
- Change the default viewport by setting `defaultViewport` property to the key of the viewport (e.g. `configure({ defaultViewport: 'iphone5' })`)
- Replace the entire viewports by setting brand new viewports to `viewports` property (e.g. `configure({ viewports: { brandNewDevice: { ... } } })`)
- Add custom viewports by first merging both the `INITIAL_VIEWPORTS` and your custom viewports, and then pass the result as `viewports` to configure function
