Update core-team.md

en/contributors/core-team.md

@@ -141,7 +141,7 @@ The core team is composed of members who make frequent contributions to the proj
       <td>Poland</td>
       <td>
           <ul>
-              <li>C#></li>
+              <li>C#</li>
               <li>Linux related stuff</li>
               <li>Asset compiler</li>
               <li>Metrics</li>