Mix task to generate changelog

lib/mix/tasks/multiverse.gen.changelog.ex

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+defmodule Mix.Tasks.Multiverse.Gen.Changelog do
+  use Mix.Task
+
+  @shortdoc "Generates a changelog from changes @moduledoc's"
+
+  @moduledoc """
+  Generate a changelog from changes @moduledoc's.
+
+  ## Changelog Generator
+
+  Multiverse doesn't make assumptions on how do you want changelog to look like
+  and where do you want it to write, instead you need to implement
+  `Multiverse.ChangelogWriter` behaviour and set it in `:multiverse`
+  application environment:
+
+  ```
+  config :multiverse,
+    changelog_generator: MyApp.ChangelogWriter,
+    endpoint: MyApp.Endpoint
+  ```
+
+  ## Examples
+
+      mix multiverse.gen.changelog -e MyApp.Endpoint
+
+  This generator will automatically open the config/config.exs
+  after generation if you have `ECTO_EDITOR` set in your environment
+  variable.
+
+  ## Command line options
+
+    * `-e`, `--endpoint` - the endpoint to inspect for effective changes;
+    * `-i`, `--include-future-version` - include future versions that are not in effect right now (default `false`);
+    * `-g`, `--generator` - the `Multiverse.ChangelogWriter` behaviour implementation to write the changelog.
+
+  """
+
+  @doc false
+  def run(args) do
+
+  end
+end