Minor formatting fixes.

Readme.md

@@ -55,8 +55,8 @@ voted on:
 
     (a-run
         ($ vote 'add-alternative "solar")
-	($ vote 'add-alternative "wind")
-	($ vote 'add-alternative "hydro"))
+        ($ vote 'add-alternative "wind")
+        ($ vote 'add-alternative "hydro"))
 
 The list of votes can be fetched with the `votes` message.