extend_subscription CLI command: Add some extra detail on the command

output.
Signed-off-by: Birin Sanchez <birin.sanchez@puri.sm>

limitmonitor/management/commands/extend_subscription.py

@@ -73,7 +73,13 @@ class Command(BaseCommand):
             self.stdout.write('Error: Could not update WC subscription.')
             return
         forced_update(user)
-        msg = 'User {} subscription has been extended {} days.'.format(
-            email, extra_days
+        msg = (
+            '\nSubscription for user {} has been extended {} days, from {} to '
+            '{}.'.format(
+                email,
+                extra_days,
+                parsed_sub['next_renewal'].strftime('%Y-%m-%d'),
+                new_ren_date.strftime('%Y-%m-%d')
+            )
         )
         self.stdout.write(msg)