style(top-level): fix prettier formatting on index.ts (#698)

should pass the test

Author: bendtherules

@commitlint/top-level/src/index.ts

@@ -7,7 +7,7 @@ export default toplevel;
  * Find the next git root
  */
 async function toplevel(cwd: string) {
-	const found = await up('.git', { cwd, type: 'directory' });
+	const found = await up('.git', {cwd, type: 'directory'});
 
 	if (typeof found !== 'string') {
 		return found;