feat: lint JavaScript in Markdown

[greatislander]

No description provided.

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[jobara]

@greatislander I tried adding a code block to the README but the linting always passed.

let test = 'test'

let function (a) {return b;}

plain text

let obj = {
  a: "a",
}

[greatislander]

@jobara did you label it as a JavaScript block, e.g.:

```js
// code
```

[jobara]

@jobara did you label it as a JavaScript block, e.g.:

// code

I had labelled it JavaScript. It does lint when labelled js.