Update example and documentation

Author: Jord-JD

README.md

@@ -22,6 +22,7 @@ and call its `status` method. You can optionally pass a `Carbon` date object
 to the `status` method to retrieve a historical status.
 
 ```php
+use Carbon\Carbon;
 use DivineOmega\GitHubStatusApi\Client;
 use DivineOmega\GitHubStatusApi\Enums\GitHubStatus;
 
@@ -49,5 +50,4 @@ switch ($status) {
 }
 
 echo PHP_EOL;
-
 ``` 

example.php

@@ -1,11 +1,13 @@
 <?php
 
+use Carbon\Carbon;
 use DivineOmega\GitHubStatusApi\Client;
 use DivineOmega\GitHubStatusApi\Enums\GitHubStatus;
 
 require_once 'vendor/autoload.php';
 
-$status = (new Client())->status();
+$status    = (new Client())->status();
+// $status = (new Client())->status(Carbon::parse('2018-12-06 17:00'));
 
 switch ($status) {
     case GitHubStatus::GOOD: