Multiline last-update (#2106)

Author: gastaldi

working-groups/templates/wg.yaml.template

@@ -9,6 +9,7 @@ working-groups:
       status: {board.getBadgeText()}
       last-activity: {board.getLastActivityDate()}
       {#if board.getLastUpdate()  && board.getLastUpdate().body.trim()}
-      last-update: {board.getLastUpdate().body.trim()}
+      last-update: |
+        {board.getLastUpdate().body.trim()}
       {/if}
-  {/for}
+  {/for}