Always run biome migrate after upgrading biome

Biome is awesome. I use it on all my side-projects. It replaces prettier and eslint. And it's significantly faster.

An annoying thing about biome is that every time you upgrade to a new version, you have to remember to run (bunx|npx) @biomejs/biome migrate --write. This is to update your checked in biome.json. But there's a solution to this! Add this to the scripts portion of your package.json:

{
  "scripts": {
    ...
    "postinstall": "bunx @biomejs/biome migrate --write"
  }
  ...

(Replace bunx with npx if you use npm)

Now, whenever you upgrade the version of @biomejs/biome it will automatically make the necessary changes to your biome.json file.