Enable PHPStan

- Fix error for level 0 & 1 (level 7 has 699 errors...)
- Add `updated_at` to site_credential (so the `timestamps()` method applies correctly)

tests/Wallabag/UserBundle/Controller/ManageControllerTest.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Wallabag\UserBundle\Tests\Controller;
+namespace Tests\Wallabag\UserBundle\Controller;
 
 use Tests\Wallabag\CoreBundle\WallabagCoreTestCase;
 

tests/Wallabag/UserBundle/Mailer/AuthCodeMailerTest.php

@@ -6,22 +6,6 @@ use PHPUnit\Framework\TestCase;
 use Wallabag\UserBundle\Entity\User;
 use Wallabag\UserBundle\Mailer\AuthCodeMailer;
 
-/**
- * @see https://www.pmg.com/blog/integration-testing-swift-mailer/
- */
-final class CountableMemorySpool extends \Swift_MemorySpool implements \Countable
-{
-    public function count()
-    {
-        return \count($this->messages);
-    }
-
-    public function getMessages()
-    {
-        return $this->messages;
-    }
-}
-
 class AuthCodeMailerTest extends TestCase
 {
     protected $mailer;

tests/Wallabag/UserBundle/Mailer/CountableMemorySpool.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Tests\Wallabag\UserBundle\Mailer;
+
+/**
+ * @see https://www.pmg.com/blog/integration-testing-swift-mailer/
+ */
+final class CountableMemorySpool extends \Swift_MemorySpool implements \Countable
+{
+    public function count()
+    {
+        return \count($this->messages);
+    }
+
+    public function getMessages()
+    {
+        return $this->messages;
+    }
+}