docs: re-arrange install commands [ci skip]

Author: metonym

README.md

@@ -14,14 +14,17 @@ The Changelog is [available on GitHub](https://github.com/metonym/svelte-highlig
 ## Installation
 
 ```bash
-# Yarn
-yarn add -D svelte-highlight
-
 # npm
 npm i -D svelte-highlight
 
 # pnpm
 pnpm i -D svelte-highlight highlight.js
+
+# Bun
+bun i -D svelte-highlight
+
+# Yarn
+yarn add -D svelte-highlight
 ```
 
 Note that [pnpm](https://github.com/pnpm/pnpm) users must also install `highlight.js`.