update link to Windows badge

Author: DennisOSRM

index.html

@@ -23,7 +23,7 @@
       <td> Project OSRM (develop, Linux) </td>
       <td> <img src="https://travis-ci.org/Project-OSRM/osrm-backend.png?branch=develop" alt="Build Status" /></b> </td>
       <td> Project OSRM (develop, Windows) </td>
-      <td> <img src="https://ci.appveyor.com/api/projects/status/97g0epxsr6ybmar0/branch/develop" alt="Build Status" /></b> </td>
+      <td> <img src="https://ci.appveyor.com/api/projects/status/4iuo3s9gxprmcjjh/branch/develop" alt="Build Status" /></b> </td>
     </tr>
     <tr>
       <td> <a href="https://scan.coverity.com/projects/183">Coverity Scan</a> (develop) </td>