Re-enable Credo ModuleDoc check

Closes #108

lib/music_brainz/artist.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.Artist do
+  @moduledoc false
+
   @enforce_keys [:id, :name, :sort_name]
   defstruct [:id, :name, :sort_name, :country, :relations, :musicbrainz_data]
 

lib/music_brainz/external_link.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.ExternalLink do
+  @moduledoc false
+
   defstruct [:name, :url]
 
   @type t :: %__MODULE__{

lib/music_brainz/release.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.Release do
+  @moduledoc false
+
   @enforce_keys [
     :id,
     :title,
@@ -38,6 +40,8 @@ defmodule MusicBrainz.Release do
         }
 
   defmodule Artist do
+    @moduledoc false
+
     @enforce_keys [:id, :name, :sort_name]
     defstruct [:id, :name, :sort_name]
 
@@ -49,6 +53,8 @@ defmodule MusicBrainz.Release do
   end
 
   defmodule Medium do
+    @moduledoc false
+
     @enforce_keys [:title, :format, :number, :track_count, :tracks]
     defstruct [:title, :format, :number, :track_count, :tracks]
 
@@ -62,6 +68,8 @@ defmodule MusicBrainz.Release do
   end
 
   defmodule Track do
+    @moduledoc false
+
     @enforce_keys [:id, :title, :artists, :length, :number, :position]
     defstruct [:id, :title, :artists, :length, :number, :position]
 

lib/music_brainz/release_group.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.ReleaseGroup do
+  @moduledoc false
+
   alias MusicBrainz.ReleaseGroupSearchResult
 
   @spec included_release_groups(map()) :: [ReleaseGroupSearchResult.t()]

lib/music_brainz/release_group_search_result.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.ReleaseGroupSearchResult do
+  @moduledoc false
+
   alias MusicBrainz.ReleaseGroup
 
   @enforce_keys [:id, :type, :title, :artists, :release_date]

lib/music_brainz/release_search_result.ex

@@ -1,4 +1,6 @@
 defmodule MusicBrainz.ReleaseSearchResult do
+  @moduledoc false
+
   alias MusicBrainz.ReleaseGroup
 
   @enforce_keys [:id, :title, :release_group, :artists, :date, :barcode, :media]