'mix licenses' doesn't work in Elixir 1.9

[garthk]

Warning shot during mix deps.compile with 1.8.2:

warning: Mix.Dep.loaded/1 is deprecated. Mix.Dep.loaded/1 was private API and you should not use it
  lib/licensir/scanner.ex:35

Failure with 1.9.4:

$ mix licenses
Notice: This is not a legal advice. Use the information below at your own risk.
** (UndefinedFunctionError) function Mix.Dep.loaded/1 is undefined or private
    (mix) Mix.Dep.loaded([])
    lib/licensir/scanner.ex:27: Licensir.Scanner.scan/0
    lib/mix/tasks/licenses.ex:18: Mix.Tasks.Licenses.run/1
    (mix) lib/mix/task.ex:331: Mix.Task.run_task/3
    (mix) lib/mix/cli.ex:79: Mix.CLI.run_task/2

[garthk]

For now, to get the “right” Elixir and Erlang with asdf:

• asdf plugin-add elixir
• asdf plugin-add erlang
• asdf install elixir 1.8.2-otp-21
• asdf install erlang 21.3.8.6
• asdf local elixir 1.8.2-otp-21
• asdf local erlang 21.3.8.6