Migrate Swiper to v4

[Matt-Jensen]

Update README.md doc to undo #78

[knownasilya]

I'm trying to use this in a CSS Grid, and having no luck (it stretches the element to wide), and thinking it might be an issue with v3. Found a similar issue for v3 https://muut.com/i/swiper/questions:css-grid-example-or-work-ar (not sure if v4 would solve) I didn't find any issues on swiper repo.

[Matt-Jensen]

I'm not sure it would either, however I'm up for getting v4 out the door.

[Matt-Jensen]

Tracking on /feature/80-swiper-v4
Currently got everything working except object configured pagination. Any help debugging would be welcome.