Remove references to deprecated `trace` field

This will not undergo a regualar deprecation cycle since the schedule
provided by discord (see discordapp/discord-api-docs#967) is less than
the amount of time it would take to fully deprecate this field. Instead
we will just consider this a v1 breaking change.

Clients on previous versions should continue to work regardless of
Discord's planned changes for this field, although the data provided
from the field may be invalid or empty.

disco/gateway/events.py

@@ -144,14 +144,12 @@ class Ready(GatewayEvent):
     user = Field(User)
     guilds = ListField(Guild)
     private_channels = ListField(Channel)
-    trace = ListField(str, alias='_trace')
 
 
 class Resumed(GatewayEvent):
     """
     Sent after a resume completes.
     """
-    trace = ListField(str, alias='_trace')
 
 
 @wraps_model(Guild)

tests/gateway/events.py

@@ -4,16 +4,13 @@ from disco.gateway.events import GatewayEvent, Resumed
 def create_resumed_payload():
     return GatewayEvent.from_dispatch(None, {
         't': 'RESUMED',
-        'd': {
-            '_trace': ['test', '1', '2', '3'],
-        }
+        'd': {}
     })
 
 
 def test_from_dispatch():
     event = create_resumed_payload()
     assert isinstance(event, Resumed)
-    assert event.trace == ['test', '1', '2', '3']
 
 
 def test_event_creation(benchmark):