style: update formatting in README

README.md

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 <h1 align="center">smoothscroll-anchor-polyfill</h1>
 <p align="center">⚓ Apply smooth scroll to anchor links to polyfill the CSS property <code>scroll-behavior</code></p>
 
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  - ✔ Updates URL with #fragment
  - ✔ Handles focus
 
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 ## Browser support
 ⚠ Requires smooth scroll for `window.scroll()` and `Element.scrollIntoView()` (e.g. [smoothscroll-polyfill](http://iamdustan.com/smoothscroll/)) to work!
 
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 > \* hashchange navigation triggered by forwards/backwards buttons isn't smooth despite native support. [Learn more](https://jonaskuske.github.io/smoothscroll-anchor-polyfill#hashchange-blink)
 
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 ## Usage