DOC bump version

Author: jnothman

doc/whats_new.rst

@@ -24,8 +24,8 @@ Legend for changelogs
 - |API|: you will need to change your code to have the same effect in the
   future; or a feature will be removed in the future.
 
+.. include:: whats_new/v0.22.rst
 .. include:: whats_new/v0.21.rst
-.. include:: whats_new/v0.20.rst
 
 .. _previous_releases_whats_new:
 

doc/whats_new/v0.22.rst

@@ -0,0 +1,45 @@
+.. include:: _contributors.rst
+
+.. currentmodule:: sklearn
+
+.. _changes_0_22:
+
+Version 0.22.0
+==============
+
+**In Development**
+
+Changed models
+--------------
+
+The following estimators and functions, when fit with the same data and
+parameters, may produce different models from the previous version. This often
+occurs due to changes in the modelling logic (bug fixes or enhancements), or in
+random sampling procedures.
+
+..
+    TO FILL IN AS WE GO
+
+Details are listed in the changelog below.
+
+(While we are trying to better inform users by providing this information, we
+cannot assure that this list is complete.)
+
+Changelog
+---------
+
+..
+    Entries should be grouped by module (in alphabetic order) and prefixed with
+    one of the labels: |MajorFeature|, |Feature|, |Efficiency|, |Enhancement|,
+    |Fix| or |API| (see whats_new.rst for descriptions).
+    Entries should be ordered by those labels (e.g. |Fix| after |Efficiency|).
+    Changes not specific to a module should be listed under *Multiple Modules*
+    or *Miscellaneous*.
+    Entries should end with:
+    :pr:`123456` by :user:`Joe Bloggs <joeongithub>`.
+    where 123456 is the *pull request* number, not the issue number.
+
+Changes to estimator checks
+---------------------------
+
+These changes mostly affect library developers.

sklearn/__init__.py

@@ -45,7 +45,7 @@
 # Dev branch marker is: 'X.Y.dev' or 'X.Y.devN' where N is an integer.
 # 'X.Y.dev0' is the canonical version of 'X.Y.dev'
 #
-__version__ = '0.21.dev0'
+__version__ = '0.22.dev0'
 
 
 # On OSX, we can get a runtime error due to multiple OpenMP libraries loaded