<@U0C12L58V> Most likely kotlin immutable collecti...

# stdlib

[ilya.gorbunov]

@yasyd Most likely kotlin immutable collections will be available for download still in the alpha state by the time kotlin 1.1 is released. What's holding us to do it now is missing implementation of immutable ordered map/set.
We have not decided on the underlying implementation, but we're going to invest resources into it in the future, not just pick one of available implementations.