Change javaconfig branch URL to spring-projects

readme.md

@@ -48,7 +48,7 @@ File -> Import -> Maven -> Existing Maven project
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     <td>Java Config branch</td>
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-      Petclinic uses XML configuration by default. In case you'd like to use Java Config instead, there is a Java Config branch available <a href="https://github.com/arey/spring-petclinic/tree/javaconfig">here</a>. Thanks to Antoine Rey for his contribution.     
+      Petclinic uses XML configuration by default. In case you'd like to use Java Config instead, there is a Java Config branch available <a href="https://github.com/spring-projects/spring-petclinic/tree/javaconfig">here</a>. Thanks to Antoine Rey for his contribution.     
     </td>
   </tr>
   <tr>