Update PyCGNS link (#6)

PyCGNS moved to github.com

Author: MicK7

Utilities.html

@@ -216,7 +216,7 @@ <h1>
 <tr>
 <td><b>PyCGNS</b></td>
 
-<td><a href="http://pycgns.sourceforge.net">PyCGNS link</a></td>
+<td><a href="https://pycgns.github.io">PyCGNS link</a></td>
 
 <td>external site</td>