Soft-deprecate (instead of hard-) Stream.uniq/2 in 1.4

The hard-deprecation should be done in version 1.5.

Author: whatyouhide

lib/elixir/lib/stream.ex

@@ -902,7 +902,6 @@ defmodule Stream do
 
   @doc false
   def uniq(enum, fun) do
-    IO.warn "Stream.uniq/2 is deprecated, use Stream.uniq_by/2 instead"
     uniq_by(enum, fun)
   end