Add zone validation

src/helpers.py

@@ -1,6 +1,5 @@
 import logging
 import subprocess
-import dns.zone
 
 from pathlib import Path
 from datetime import datetime, UTC

src/technitium.py

@@ -1,5 +1,6 @@
 import logging
 import requests
+import dns.zone
 
 from config import *