Add a small release not about the range metadata.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153391 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ReleaseNotes.html

@@ -290,6 +290,8 @@ Release Notes</a>.</h1>
     <li>IR support for vectors of pointers, including vector GEPs.</li>
     <li>Module flags have been introduced. They convey information about the
         module as a whole to LLVM subsystems.</li>
+    <li>Loads can now have range metadata attached to them to restrict the
+        possible values being loaded.</li>
     <li>....</li>
   </ul>
 </div>