Add exclude filter for Telia

Author: glennmatthews

circuit_maintenance_parser/provider.py

@@ -301,6 +301,8 @@ class Sparkle(GenericProvider):
 class Telia(GenericProvider):
     """Telia provider custom class."""
 
+    _exclude_filter = {EMAIL_HEADER_SUBJECT: ["Disturbance Information"]}
+
     _default_organizer = "[email protected]"