[clang] Update clang/www/cxx_dr_status.html for CWG 960.

Author: bricknerb

clang/www/cxx_dr_status.html

@@ -5579,7 +5579,7 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
     <td><a href="https://cplusplus.github.io/CWG/issues/960.html">960</a></td>
     <td>CD2</td>
     <td>Covariant functions and lvalue/rvalue references</td>
-    <td class="unknown" align="center">Unknown</td>
+    <td class="full" align="center">Clang 2.8</td>
   </tr>
   <tr id="961">
     <td><a href="https://cplusplus.github.io/CWG/issues/961.html">961</a></td>