Clarify keyword list as options example by including else clause

lib/koans/08_keyword_lists.ex

@@ -34,9 +34,14 @@ defmodule KeywordLists do
 
   koan "Conveniently keyword lists can be used for function options" do
     transform = fn str, opts ->
-      if opts[:upcase], do: String.upcase(str)
+      if opts[:upcase] do
+        String.upcase(str)
+      else
+        str
+      end
     end
 
     assert transform.("good", upcase: true) == ___
+    assert transform.("good", upcase: false) == ___
   end
 end

test/koans/keyword_lists_koans_test.exs

@@ -9,7 +9,7 @@ defmodule KeywordListsTests do
       "baz",
       {:multiple, [:foo, "bar"]},
       "foo",
-      "GOOD",
+      {:multiple, ["GOOD", "good"]},
     ]
 
     test_all(KeywordLists, answers)