remove unsupported config line

example_configs/pmmlrc

@@ -3,7 +3,6 @@
         "recipients": ["user1@example.org", "user2@example.org" ],
         "smtp_server": "smtp.example.org",
         "smtp_port": 587,
-        "connection": "STARTTLS",
         "smtp_user": "mailinglist@example.org",
         "smtp_pass": "PASSWORD"
     }

pmml.py

@@ -34,7 +34,7 @@ def cli(config_file, mailing_list_address):
     msg = email.parser.Parser().parse(input)
 
     if msg["Subject"] in ignore_subjects:
-        print(f"Skipping processing because auf subject: {msg['Subject']}")
+        print(f"Skipping processing because of subject: {msg['Subject']}")
     else:
         smtp_client = setup_smtp_session(
             config["smtp_server"],