minor #4898 added Kévin Dunglas as a merger for the Serializer component (fabpot)

This PR was merged into the 2.3 branch.

Discussion
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added Kévin Dunglas as a merger for the Serializer component

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | no
| Applies to    | all
| Fixed tickets | n/a

see http://symfony.com/blog/new-symfony-core-team-member-kevin-dunglas

Commits
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8ea0fef added Kévin as a merger for the Serializer component

Author: weaverryan

contributing/code/core_team.rst

@@ -57,7 +57,10 @@ Active Core Members
   * **Christophe Coevoet** (:merger:`stof`) can merge into the BrowserKit_,
     Config_, Console_, DependencyInjection_, DomCrawler_, EventDispatcher_,
     HttpFoundation_, HttpKernel_, Serializer_, Stopwatch_, DoctrineBridge_,
-    MonologBridge_, and TwigBridge_ components.
+    MonologBridge_, and TwigBridge_ components;
+
+  * **Kévin Dunglas** (:merger:`dunglas`) can merge into the Serializer_
+    component.
 
 * **Deciders** (``@symfony/deciders`` on GitHub):