Replace then by anonymous function to fix the pipeline

config/config.exs

@@ -1,6 +1,6 @@
 # This file is responsible for configuring your application
 # and its dependencies with the aid of the Mix.Config module.
-import Config
+use Mix.Config
 
 # This configuration is loaded before any dependency and is restricted
 # to this project. If another project depends on this project, this

config/dev.exs

@@ -1 +1 @@
-import Config
+use Mix.Config

config/test.exs

@@ -1,4 +1,4 @@
-import Config
+use Mix.Config
 
 config :dataloader, Dataloader.TestRepo,
   hostname: "localhost",

test/dataloader/ecto_test.exs

@@ -38,13 +38,13 @@ defmodule Dataloader.EctoTest do
 
     User
     |> where(^Enum.to_list(args))
-    |> then(fn user ->
+    |> (fn user ->
       if is_nil(sort_by) or is_nil(sort_order) do
         user
       else
         order_by(user, {^sort_order, ^sort_by})
       end
-    end)
+    end).()
   end
 
   defp query(queryable, _args, test_pid) do