Fix link to devOpen in footer

IBM target link has changed.
Update to fix the broken link.

Closes: #21

Signed-off-by: Sue Chaplain <sue_chaplain@uk.ibm.com>

_includes/footer/footer-en.html

@@ -11,7 +11,7 @@
 				<span class="f_link">&nbsp;<i class="fa fa-chevron-circle-right f_mini" aria-hidden="true"></i>&nbsp;&nbsp;<a href="https://projects.eclipse.org/projects/technology.omr">OMR on Eclipse Technology projects</a>
 				</span>
 				<br>
-				<span class="f_link"><i class="fa fa-graduation-cap f_mini" aria-hidden="true"></i>&nbsp;&nbsp;<a href="https://developer.ibm.com/open/omr/">OMR on developerWorks Open</a>
+				<span class="f_link"><i class="fa fa-graduation-cap f_mini" aria-hidden="true"></i>&nbsp;&nbsp;<a href="https://developer.ibm.com/code/open/projects/eclipse-omr/">OMR on developerWorks Open</a>
 				</span>	
 			</div>
 		</div>