update history for 2.2.0 release

Updates history and __init__ for 2.2.0 release.

Update HISTORY.md

Author: tpike3

HISTORY.md

@@ -2,6 +2,34 @@
 title: Release History
 ---
 
+# 2.2.0 (2023-12-29)
+
+This release introduces Mesa's new process for integrating new features under the experimental label, which we
+anticipate will help Mesa evolve faster and more effectively. Started with Mesa's new visualization approach by @rht.
+@EwoutH has added two new experimental features, an `AgentSet` class. This represents a significant new approach in
+handling agents that will allow for much greater user specificity agent scheduling. @EwoutH also added a
+`DiscreteEventScheduler` class in `time.py`. In addition, there are several other minor improvements and fixes.
+
+**Improvements**
+
+- space: add `move_agent_to_one_of` function (#1920)
+- experimental: Introduce `AgentSet` class (#1916)
+- model: add nested dictionary of agents in `model.py` (#1894)
+- experimental: Add discrete event scheduler (#1890)
+- space: Improve docstrings for empty cells in `space.py`  (#1888)
+
+**Visualization**
+
+- bug: remove empty space drawer when rendering in browser (#1907)
+
+**Docs and Tutorial**
+
+- docs: Fix README.md inline code formatting (#1887)
+
+**CI and WorkFlows**
+
+- ci: Speed up pip install by caching deps install output (#1885)
+
 # 2.1.5 (2023-11-26)
 
 This release has some critical fixes to JupyterViz/Solara frontend to prevent
@@ -20,7 +48,7 @@ improvements to datacollection and the documentation.
 
 **CI and WorkFlows**
 
-- ci: Remove redundant Ruff workflow from GitHub Actions (#1880)
+- ci: Remove redundant ruff workflow from GitHub Actions (#1880)
 - Replace Black with ruff format (#1880)
 - Migrate setup from `setup.py` to `pyproject.toml` (#1870)
 

mesa/__init__.py

@@ -25,7 +25,7 @@
 ]
 
 __title__ = "mesa"
-__version__ = "2.1.5"
+__version__ = "2.2.0"
 __license__ = "Apache 2.0"
 _this_year = datetime.datetime.now(tz=datetime.timezone.utc).date().year
 __copyright__ = f"Copyright {_this_year} Project Mesa Team"