Tiny README syntax markup for consistency (#1164)

Author: fwolfst

README.md

@@ -441,7 +441,7 @@ Pass the `:as => :array` option to any of the above methods of configuration
 
 ### Array of Hashes
 
-The default result type is set to :hash, but you can override a previous setting to something else with :as => :hash
+The default result type is set to `:hash`, but you can override a previous setting to something else with `:as => :hash`
 
 ### Timezones