added Python 3.13 to pyproject.toml

Not really related to this PR, but it seemed like a good idea since Python 3.13 came out last October

Author: dave-doty

pyproject.toml

@@ -41,6 +41,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "License :: OSI Approved :: BSD License",
     "Intended Audience :: Science/Research",
     "Topic :: Scientific/Engineering",
@@ -104,10 +105,10 @@ dependencies = [
 name.echo.features = ["echo"]
 
 [[tool.hatch.envs.hatch-test.matrix]]
-python = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+python = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 
 [[tool.hatch.envs.hatch-test.matrix]]
-python = ["3.10", "3.11", "3.12"]
+python = ["3.10", "3.11", "3.12", "3.13"]
 feature = ["echo"]
 
 [tool.ruff]