Update link to history site

Link to History site was resulting in 404. Switched from http://www.unl.edu/history/ to http://history.unl.edu/

depts/g_k.shtml

@@ -130,7 +130,7 @@
<td><h3>College</h3> </td>
</tr>
<tr>
-                                <td><a href="http://www.unl.edu/history/">History</a></td>
+                                <td><a href="http://history.unl.edu/">History</a></td>
<td>&nbsp;</td>
<td><a href="http://ascweb.unl.edu/">Arts &amp; Sciences</a></td>
</tr>