use css native start and end

[EmeraldSnorlax]

this definitely fixes #39, and might solve #25

ive naively just edited the file in node_modules and it seems to behave correctly, so ive copied the changes up here.

[20lives]

This can solve a lot and not only with text-align
when I first published this package logical properties were still relatively rare, need to confirm the browser's support is better today
https://caniuse.com/css-logical-props