Fix a bunch of deprecation warnings

Author: iamvery

lib/display/intro.ex

@@ -6,7 +6,7 @@ defmodule Display.Intro do
     if module in modules do
       ""
     else
-      show_intro(module.intro)
+      module.intro() |> show_intro()
     end
   end
 

lib/execute.ex

@@ -1,7 +1,8 @@
 defmodule Execute do
   @moduledoc false
   def run_module(module, callback \\ fn _result, _module, _koan -> nil end) do
-    Enum.reduce_while(module.all_koans, :passed, fn koan, _ ->
+    module.all_koans()
+    |> Enum.reduce_while(:passed, fn koan, _ ->
       module
       |> run_koan(koan)
       |> hook(module, koan, callback)

lib/koans/03_numbers.ex

@@ -110,7 +110,7 @@ defmodule Numbers do
   end
 
   koan "I want the first and last in the range" do
-    first..last = Range.new(1, 10)
+    first..last//_step = Range.new(1, 10)
 
     assert first == ___
     assert last == ___

lib/tracker.ex

@@ -18,7 +18,7 @@ defmodule Tracker do
   def set_total(modules) do
     total =
       modules
-      |> Enum.flat_map(& &1.all_koans)
+      |> Enum.flat_map(& &1.all_koans())
       |> Enum.count()
 
     Agent.update(__MODULE__, fn _ -> %Tracker{total: total} end)

test/test_helper.exs

@@ -6,7 +6,7 @@ defmodule TestHarness do
   import ExUnit.Assertions
 
   def test_all(module, answers) do
-    module.all_koans
+    module.all_koans()
     |> check_answer_count(answers, module)
     |> Enum.zip(answers)
     |> run_all(module)