Public utility methods for stringify/symbolize keys

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 The KeyConversion extension gives you the convenience methods of `symbolize_keys` and `stringify_keys` along with their bang counterparts. You can also include just stringify or just symbolize with `Hashie::Extensions::StringifyKeys` or `Hashie::Extensions::SymbolizeKeys`.
 
+Hashie also has a utility method for converting keys on a Hash within including a mixin:
+
+```ruby
+Hashie.symbolize_keys! hash
+# => Symbolizes keys of hash.
+Hashie.symbolize_keys hash
+# => Returns a copy of hash with keys symbolized.
+Hashie.stringify_keys hash
+# => Stringifies keys of hash.
+Hashie.stringify_keys hash
+# => Returns a copy of hash with keys stringified.
+```
+
 ### MergeInitializer
 
 The MergeInitializer extension simply makes it possible to initialize a Hash subclass with another Hash, giving you a quick short-hand.