Add preact-cli as default dependency in Preact Template

[Saeris]

When you create a new project using the Preact template, it's default dependencies are only preact and preact-compat, here's an example of what the default package.json for a new Preact template project looks like:

{
  "name": "n4qn6vrz54",
  "version": "1.0.0",
  "description": "",
  "keywords": [],
  "main": "index.js",
  "dependencies": {
    "preact": "8.2.5",
    "preact-compat": "3.17.0"
  }
}

This is a problem because as stated in the GitHub import documentation, preact-cli is required as a dependency to infer the right template to use. Without it, CodeSandbox defaults to create-react-app as it's template instead, which causes all sorts of "Could not resolve dependency 'react' realtive to..." errors. I discovered this after building a new project in CodeSandbox using the Preact template, saving it to a new repository on GitHub, which when re-imported to CodeSandbox it defaulted to the React template instead.

I would open a PR for this myself if I could find out where default dependencies are listed for each of the templates. It isn't quite clear from the source code I found under packages/common/templates/ as to where those might be located.

[CompuIves]

I updated the template! I had to give my account access to the template to make it work, it's a bit cumbersome but has worked until now 🙂.

I also took the liberty to update preact to the latest version, you can see it here: https://codesandbox.io/s/preact