Move explicit exit out of display function

lib/display.ex

@@ -56,7 +56,6 @@ defmodule Display do
   def congratulate do
     format_green("\nYou have learned much. You must find your own path now.")
     |> IO.puts
-    exit(:normal)
   end
 
   def clear_screen do

lib/meditate.ex

@@ -16,7 +16,10 @@ defmodule Mix.Tasks.Meditate do
     |> Tracker.start
     |> Runner.run
 
-    if Tracker.complete?, do: Display.congratulate
+    if Tracker.complete? do
+      Display.congratulate
+      exit(:normal)
+    end
 
     receive do
       {:DOWN, _references, :process, ^watcher, _reason} -> nil

lib/watcher.ex

@@ -13,7 +13,10 @@ defmodule Watcher do
         e -> Display.show_compile_error(e)
       end
 
-      if Tracker.complete?, do: Display.congratulate
+      if Tracker.complete? do
+        Display.congratulate
+        exit(:normal)
+      end
     end
   end
 end