add semcog

Author: bstabler

README.md

@@ -12,6 +12,7 @@ The ActivitySim project is led by a consortium of Metropolitan Planning Organiza
     <td align="center"><a href="http://www.sfcta.org" rel="SFCTA"><img src="sfcta.png"/></a></td>
     <td align="center"><a href="http://www.sandag.org" rel="SANDAG"><img src="sandag.jpg"/></a></td>
     <td align="center"><a href="https://atlantaregional.org" rel="ARC"><img src="arc.png"/></a></td> 
+    <td align="center"><a href="http://semcog.org" rel="SEMCOG"><img src="SEMCOG.jpg"/></a></td> 
     <td align="center"><a href="http://www.ampo.org" rel="AMPO"><img src="ampo.png"/></a></td>
   </tr>
 </table>