fix create subscriber

[ratnayake]

create subscriber has wrong endpoint. fixed it

[twisted1919]

I don't think that's the case, the url rule in the api is defined as:
array('list_subscribers/create', 'pattern' => 'lists/<list_uid:([a-z0-9]+)>/subscribers', 'verb' => 'POST'),, which means $this->config->getApiUrl(sprintf('lists/%s/subscribers', (string)$listUid)) is the correct endpoint.

[ratnayake]

but it's not work for me and when i changed subscribers to subscribe works fine

[twisted1919]

There has to be something else, check your app versions, additional extensions, etc.