Remove member count tracking.

disco/state.py

@@ -290,11 +290,6 @@ class State(object):
         if event.member.guild_id not in self.guilds:
             return
 
-        if (self.guilds[event.member.guild_id].member_count is not UNSET and
-                # Avoid adding duplicate events to member_count.
-                event.member.id not in self.guilds[event.member.guild_id].members):
-            self.guilds[event.member.guild_id].member_count += 1
-
         self.guilds[event.member.guild_id].members[event.member.id] = event.member
 
     def on_guild_member_update(self, event):
@@ -313,9 +308,6 @@ class State(object):
         if event.user.id not in self.guilds[event.guild_id].members:
             return
 
-        if self.guilds[event.guild_id].member_count is not UNSET:
-            self.guilds[event.guild_id].member_count -= 1
-
         del self.guilds[event.guild_id].members[event.user.id]
 
     def on_guild_members_chunk(self, event):