add file object to dump call

bot.py

@@ -34,7 +34,7 @@ class IRCBot():
         
     def write_config(self):
         with open("config.json", "w") as f:
-            dump(self.config, indent=2)
+            dump(self.config, f, indent=2)
 
     def join_channel(self, channel):
         self.sendline(f"JOIN {channel}")