Fix broken --help flag

Currently, `allowUnknownFlags: false` is commented out, which is not
ideal, because the error message the user gets when using an unknown
flag is pretty confusing:

```
$ chalk --foobar
Input required
```

The actual problem is in meow (see sindresorhus/meow#197), but it's been
taking a while to come up with a proper fix for that (see
sindresorhus/meow#198), so I suggest using this workaround in the
meantime.

See: chalk#32, chalk#33, chalk#39, sindresorhus/meow#197, sindresorhus/meow#198

cli.js

@@ -52,9 +52,12 @@ const cli = meow(`
 	  $ echo 'Unicorns from stdin' | chalk --stdin red bold
 `, {
 	importMeta: import.meta,
-	// TODO: Disabled until https://github.com/sindresorhus/meow/issues/197 is fixed.
-	// allowUnknownFlags: false,
+	allowUnknownFlags: false,
 	flags: {
+		// TODO: Can be removed when https://github.com/sindresorhus/meow/issues/197 is fixed.
+		help: {type: 'boolean'},
+		version: {type: 'boolean'},
+
 		template: {
 			type: 'string',
 			alias: 't',