Merge pull request #173 from eht16/fix_send_mail_command_cron_warning

Fix condition for deprecated '--cron' argument in "send_mail" command

src/mailer/management/commands/send_mail.py

@@ -17,7 +17,7 @@ class Command(CronArgMixin, BaseCommand):
     help = "Do one pass through the mail queue, attempting to send all mail."
 
     def handle(self, *args, **options):
-        if options["cron"] == 0:
+        if options["cron"]:
             warnings.warn(
                 "send_mail's -c/--cron option is no longer necessary and will be removed in a future release",
                 DeprecationWarning,