release-0.5.0.rst in embulk-0.5.1

- old
+ new

@@ -16,10 +16,12 @@
 
   * Added ``Embulk::InputPlugin.guess(config)`` and ``spi.InputPlugin#guess(config)`` methods for Ruby and Java plugins.
 
   * ``guess`` subcommand executes the new guess method and takes the return value of the method.
 
+Plugins can use new ``Guess::SchemaGuess`` utility class for ease of implementation.
+
 For example, if you write a parser plugin named ``myparser``, you can use this configuration file first:
 
 .. code-block:: yaml
 
     in:
@@ -48,9 +50,15 @@
 
 .. code-block:: console
 
     $ embulk gem install embulk-input-myinput
     $ embulk guess config.yml -o guessed.yml
+
+Plugin API
+------------------
+
+* Added ``Guess::SchemaGuess`` class. This utility class inputs array of hash objects or array of array objects and returns schema.
+
 
 Plugin SPI
 ------------------
 
 * Added ``Embulk::InputPlugin.guess(config)`` method for Ruby input plugins.