Allow different orientations

[seblavoie]

Hey, thanks for developing this!

I'd love to be able to adjust the orientation requested. Right now, it seems like it's hard coded here:

unsplash-image-picker/src/component/picker/index.tsx

Line 54 in 3932313

orientation: 'landscape'

It would be great to have the option of passing to the component what gets sent through unsplash.search.getPhotos().

I'm not very well setup to develop in typescript so sorry for just asking instead of suggesting a pull request, but if this can be done it would be greatly appreciated!