Bump minor version number

.bumpversion.cfg

@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 2.1.0
+current_version = 2.2.0
 commit = False
 tag = False
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(\-(?P<release>[a-z]+)\.(?P<build>\d+))?

CHANGELOG.rst

@@ -4,6 +4,17 @@ This file is updated every release since v1.0.0 with the use of towncrier from t
 
 .. towncrier release notes start
 
+Openskill 2.2.0 (2022-03-18)
+============================
+
+Features
+--------
+
+- ``tau`` (defaults to 0): Additive dynamics factor, which keeps a player's rating from getting stuck at a level. Normally, a player's sigma will only decrease as we gain more information about their performance. This option will put some pressure on this back up. This default will change to be sigma/100 with v3, to be more congruent with TrueSkill, but higher may make your rating system more exciting. (`#50 <https://github.com/OpenDebates/openskill.py/issues/50>`_)
+
+- ``prevent_sigma_increase`` (defaults to false): for a tau > 0, it is possible that a player could play someone with a low enough rating that even if they win, their ordinal rating will still go down slightly. If your players have no agency in matchmaking, it is not desirable to have a situation where a player goes down on the leaderboard even though they win. (`#50 <https://github.com/OpenDebates/openskill.py/issues/50>`_)
+
+
 Openskill 2.1.0 (2022-03-10)
 ============================
 

openskill/__init__.py

@@ -9,4 +9,4 @@
 )
 
 
-__version__ = "2.1.0"
+__version__ = "2.2.0"