Add Sonar (#14)

* Add Sonar

* Fix code smells

app/args.py

@@ -7,7 +7,7 @@ import argparse
 from app.query_normalisation import get_public_ip
 
 
-def parse_args() -> argparse.Namespace:
+def parse_args() -> argparse.Namespace:  # pragma: no cover
     """Get arguments from user via the command line."""
     parser = argparse.ArgumentParser(
         description="Query information about an IP address or domain name."