Squash warnings about missing inits

lib/display.ex

@@ -8,6 +8,10 @@ defmodule Display do
     GenServer.start_link(__MODULE__, %{clear_screen: true}, name: __MODULE__)
   end
 
+  def init(args) do
+    {:ok, args}
+  end
+
   def disable_clear do
     GenServer.cast(__MODULE__, :disable_clear)
   end

lib/koans/18_genservers.ex

@@ -8,6 +8,9 @@ defmodule GenServers do
 
     #####
     # External API
+    def init(args) do
+      {:ok, args}
+    end
 
     def start_link(init_password) do
       # The __MODULE__ macro returns the current module name as an atom

lib/runner.ex

@@ -31,6 +31,10 @@ defmodule Runner do
 
   def modules_to_run(start_module), do: Enum.drop_while(modules(), &(&1 != start_module))
 
+  def init(args) do
+    {:ok, args}
+  end
+
   def start_link do
     GenServer.start_link(__MODULE__, [], name: __MODULE__)
   end