Replace datetime.utcnow (#51)

Author: cdce8p

onvif/client.py

@@ -72,7 +72,7 @@ def __init__(self, user, passw, dt_diff=None, **kwargs):
     def apply(self, envelope, headers):
         old_created = self.created
         if self.created is None:
-            self.created = dt.datetime.utcnow()
+            self.created = dt.datetime.now(tz=dt.timezone.utc).replace(tzinfo=None)
         if self.dt_diff is not None:
             self.created += self.dt_diff
         result = super().apply(envelope, headers)