This is about **Bulma**. Thank you for this great framework! Can we support portrait ratios corresponding the existing landscape ratios for images? I'm thinking `is-3by4`, `is-2by3`, `is-9by16`, `is-1by2`. Maybe add `is-5by4` and `is-4by5` too as it's also a [common aspect ratio](https://en.wikipedia.org/wiki/Aspect_ratio_(image)#Still_photography)? I'll create a PR if you want.