[doc] More 1.3 preparation

Author: Arnaud Degroote

doc/sphinxext/indexcontent.html

@@ -8,7 +8,7 @@
 			 <span class="linkdescr">A tour of MORSE features</span></p>
          </td>
 		<td width="50%">
-		  <p class="biglink"><a class="biglink" href="{{ pathto("what_new") }}">What's new in MORSE 1.2?</a><br/>
+		  <p class="biglink"><a class="biglink" href="{{ pathto("what_new") }}">What's new in MORSE 1.3?</a><br/>
 			 <span class="linkdescr">The latest updates of the simulator</span></p>
 		</td>
     </tr>