add guild join/leave notifications

nomen/main.py

@@ -191,6 +191,26 @@ async def on_error(event, *args, **kwargs):
     log.error(f"Error in event {event}.\nargs={pargs}\nkwargs={pkwargs}", exc_info=sys.exc_info())
 
 
+@bot.listen()
+async def on_guild_join(guild):
+    await bot.owner.send(
+        f"""\
+# Guild Joined: {guild.name}
+Guild ID: `{guild.id}`
+Member Count: `{guild.member_count}`"""
+    )
+
+
+@bot.listen()
+async def on_guild_remove(guild):
+    await bot.owner.send(
+        f"""\
+# Guild Removed: {guild.name}
+Guild ID: `{guild.id}`
+Member Count: `{guild.member_count}`"""
+    )
+
+
 help_timeouts = {}