Version number change in the Web page

doc/site/index.htm

@@ -45,7 +45,7 @@ While the library is easy to use, some basic knowledge of the ELF binary format
 is required. Such Information can easily be found on the Web.
 </p>
 <p>
-Current version of <em>ELFIO</em> library is 2.0 and it is distributed under
+Current version of <em>ELFIO</em> library is 2.1 and it is distributed under
 <a href="http://www.opensource.org/licenses/MIT">MIT License</a> conditions.
 </p>
 <p>