[Suggestion] Receive option as hashmap

[kination]

Hello,
While using the module, there are a situation to receive configs as HashMap.
But in the example I could only find setting config one by one using ClientConfig::new().set().set()...

Is there some option to put option as hashmap such as

let config = HashMap::new();
// ...
let client_config = ClientConfig::new().set_config_map(config);
...

?

[benesch]

Fixed in #367. Thanks, @djKooks!