Fix suggestions when using typespecs returning a remote type

[sarahkw]

As shown in the following code:

  defmodule Mod do
    @spec fun() :: NaiveDateTime.t()
    def fun(), do: NaiveDateTime.new(1, 2)

    def some do
      var = fun()
      var.h
      #    ^  suggestion here
    end
  end

It should be able to suggest from NaiveDateTime.

This wasn't working before because the __aliases__ weren't being handled:

iex(1)> Code.string_to_quoted("@spec fun() :: NaiveDateTime.t()")
{:ok,
 {:@, [line: 1],
  [
    {:spec, [line: 1],
     [
       {:"::", [line: 1],
        [
          {:fun, [line: 1], []},
          {{:., [line: 1], [{:__aliases__, [line: 1], [:NaiveDateTime]}, :t]},
           [line: 1], []}
        ]}
     ]}
  ]}}

[lukaszsamson]

Thanks