README.md in wp-hmac-0.2.2 vs README.md in wp-hmac-0.2.3

@@ -62,16 +62,16 @@
 ### Using the client
 
 Use like this ...
 ``` ruby
    WP::HMAC::Client.get('https://www.example.com/api/staff')
-   WP::HMAC::Client.post('https://www.example.com/api/schedules, {'HEADER' => 'foo'}, StringIO.new('data'))
+   WP::HMAC::Client.post('https://www.example.com/api/schedules, {'HEADER' => 'foo'}, 'data')
 ```
  ... or like this:
 ``` ruby
    client = WP::HMAC::Client.new('https://www.example.com')
    client.get('api/staff')
-   client.post('api/schedules', {}, StringIO.new('data'))
+   client.post('api/schedules', {}, 'data')
 ```
 See Rack::Client docs for more.
 
 ## Testing