- prepare release 6.2.1a2, fix package description

Author: dataflake

pyproject.toml

@@ -10,7 +10,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "ExtensionClass"
-version = "6.2.1a1"
+version = "6.2.1a2"
 description = "Metaclass for subclassable extension types"
 requires-python = ">=3.10"
 license = "ZPL-2.1"
@@ -37,6 +37,7 @@ classifiers = [
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
 ]
+dynamic = ["readme"]
 dependencies = []
 
 [project.optional-dependencies]