Various refactoring and typespec improvements

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mix/tasks/mobilizon/actors/new.ex

@@ -94,7 +94,7 @@ defmodule Mix.Tasks.Mobilizon.Actors.New do
       {:admin, nil} ->
         shell_error("Profile with username #{Keyword.get(options, :group_admin)} wasn't found")
 
-      {:error, :insert_group, %Ecto.Changeset{errors: errors}, _} ->
+      {:error, %Ecto.Changeset{errors: errors}} ->
         shell_error(inspect(errors))
         shell_error("Error while creating group because of the above reason")
     end

lib/mix/tasks/mobilizon/actors/utils.ex

@@ -50,6 +50,8 @@ defmodule Mix.Tasks.Mobilizon.Actors.Utils do
     new_person
   end
 
+  @spec create_group(Actor.t(), String.t(), String.t(), Keyword.t()) ::
+          {:ok, Actor.t()} | {:error, Ecto.Changeset.t()}
   def create_group(%Actor{id: admin_id}, username, name, _options \\ []) do
     {username, name} = username_and_name(username, name)