Add new test illustrating spawning processes

lib/koans/10_processes.ex

@@ -11,6 +11,12 @@ defmodule Processes do
     assert information[:status] == ___
   end
 
+  koan "New processes are spawned" do
+    pid = spawn(fn -> nil end)
+
+    assert Process.alive?(pid) == ___
+  end
+
   koan "You can send messages to any process you want" do
     send self(), "hola!"
     assert_receive ___

test/koans/processes_koans_test.exs

@@ -6,6 +6,7 @@ defmodule ProcessesTests do
     answers = [
       true,
       :running,
+      true,
       "hola!",
       :how_are_you?,
       {:waited_too_long, "I am inpatient"},