add archives to mailingLists tag

[skip ci]

Author: mtf90

pom.xml

@@ -50,18 +50,21 @@ limitations under the License.
             <subscribe>learnlib-qa+subscribe@googlegroups.com</subscribe>
             <unsubscribe>learnlib-qa+unsubscribe@googlegroups.com</unsubscribe>
             <post>learnlib-qa@googlegroups.com</post>
+            <archive>https://groups.google.com/d/forum/learnlib-qa</archive>
         </mailingList>
         <mailingList>
             <name>Discussion List</name>
             <subscribe>learnlib-discussion+subscribe@googlegroups.com</subscribe>
             <unsubscribe>learnlib-discussion+unsubscribe@googlegroups.com</unsubscribe>
             <post>learnlib-discussion@googlegroups.com</post>
+            <archive>https://groups.google.com/d/forum/learnlib-discussion</archive>
         </mailingList>
         <mailingList>
             <name>Developers List</name>
             <subscribe>learnlib-internal+subscribe@googlegroups.com</subscribe>
             <unsubscribe>learnlib-internal+unsubscribe@googlegroups.com</unsubscribe>
             <post>learnlib-internal@googlegroups.com</post>
+            <archive>https://groups.google.com/d/forum/learnlib-internal</archive>
         </mailingList>
     </mailingLists>