<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def cmd_config_set(key, value):
 """Set VALUE to the config KEY. Note: By default, KEY is converted to uppercase. Example: \b $ habu.config.set DNS_SERVER 8.8.8.8 """


    habucfg = loadcfg(environment=False)
    habucfg[key.upper()] = value
    with Path('~/.habu.json').expanduser().open('w') as f:
        f.write(json.dumps(habucfg, indent=4, sort_keys=True))