Needs to update Installation section

[IlyaUmanets]

Currently this section says that you need to have such code in your initializer file

Determinator.configure(
  retrieval: Determinator::Retrieve::Dynaconf.new(host: 'localhost:2345'),
  feature_cache: Determinator::Cache::FetchWrapper.new(
    ActiveSupport::Cache::MemoryStore.new(expires_in: 1.minute)
  )
)

But, this class Determinator::Retrieve::Dynaconf does not require host parameter anymore, it requires these parameters base_url, service_name instead