Add missing former core member

Author: fabpot

contributing/code/core_team.rst

@@ -98,7 +98,8 @@ Symfony contributions:
 * **Bernhard Schussek** (`webmozart`_);
 * **Abdellatif AitBoudad** (`aitboudad`_);
 * **Romain Neutron** (`romainneutron`_);
-* **Jordi Boggiano** (`Seldaek`_).
+* **Jordi Boggiano** (`Seldaek`_);
+* **Lukas Kahwe Smith** (`lsmith77`_).
 
 Core Membership Application
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~