docs and tests fixes

doc/html/boost_optional/relnotes.html

@@ -39,6 +39,10 @@
           Fixed <a href="https://github.com/boostorg/optional/issues/59" target="_top">issue
           #59</a>.
         </li>
+<li class="listitem">
+          Fixed bug with initialization of certain wrapper types in clang with -std=c++03.
+          See <a href="https://github.com/boostorg/optional/pull/64" target="_top">pr #64</a>.
+        </li>
 </ul></div>
 <h4>
 <a name="boost_optional.relnotes.h1"></a>