Remove a redundant case

Author: alco

_posts/2012-04-21-hello-macros.markdown

@@ -165,12 +165,7 @@ The `[root: "assets"]` Keyword is what ends up in the `_opts` argument of our `_
 
     # In module Feb
     defmacro __using__(module, opts) do
-      root_val = case Keyword.get(opts, :root) do
-      match: nil
-        "."
-      match: other
-        other
-      end
+      root_val = case Keyword.get(opts, :root, ".")
 
       quote do
         import Feb, only: [get: 2, post: 2]