Add changelog for 4.0.0 and bump version

Author: vivekjoshy

.bumpversion.cfg

@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 3.3.0
+current_version = 4.0.0
 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 +4,28 @@ This file is updated every release since v1.0.0 with the use of towncrier from t
 
 .. towncrier release notes start
 
+Openskill 4.0.0 (2022-12-11)
+============================
+
+Breaking Changes
+----------------
+
+- Drop support for Python 3.7 (`#80 <https://github.com/OpenDebates/openskill.py/issues/80>`_)
+
+
+Features
+--------
+
+- Add support for PyPy 3.8 and 3.9 (`#80 <https://github.com/OpenDebates/openskill.py/issues/80>`_)
+- Drop scipy as dependency (`#80 <https://github.com/OpenDebates/openskill.py/issues/80>`_)
+
+
+Documentation Improvements
+--------------------------
+
+- Improve SEO of Documentation (`#80 <https://github.com/OpenDebates/openskill.py/issues/80>`_)
+
+
 Openskill 3.3.0 (2022-12-06)
 ============================
 

changes/80.breaking.rst

@@ -9,4 +9,4 @@
     team_rating,
 )
 
-__version__ = "3.3.0"
+__version__ = "4.0.0"