Swap order of zipped lists to create learning opportunity

Zipping atoms and numbers creates an opportunity for the learner to
realize "💡 I just made a keyword list!"

lib/koans/10_enums.ex

@@ -55,9 +55,9 @@ defmodule Enums do
   end
 
   koan "Zip-up in pairs!" do
-    numbers = [1, 2, 3]
     letters = [:a, :b, :c]
-    assert Enum.zip(numbers, letters) == ___
+    numbers = [1 ,2 ,3]
+    assert Enum.zip(letters, numbers) == ___
   end
 
   koan "When you want to find that one pesky element" do

test/koans/enum_koans_test.exs

@@ -15,7 +15,7 @@ defmodule EnumTests do
       [1,2,3],
       [1,2,3,4,5],
       [1,2,3],
-      [{1, :a}, {2, :b}, {3, :c}],
+      [a: 1, b: 2, c: 3],
       2,
       nil,
       :no_such_element,