Update pyproject.toml

Signed-off-by: David Osipov <[email protected]>

Author: DavidOsipov

pyproject.toml

@@ -13,7 +13,7 @@ maintainers = [
 ]
 description = "Post-Quantum Secure Feldman's Verifiable Secret Sharing (VSS) in Python"
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.8, <4.0"
 license = {text = "MIT"}
 classifiers = [
     "Development Status :: 4 - Beta",
@@ -26,6 +26,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Security",
     "Topic :: Security :: Cryptography",
     "Topic :: Software Development :: Libraries :: Python Modules",
@@ -138,4 +139,4 @@ ignore_missing_imports = true
 [tool.flake8]
 max-line-length = 88
 extend-ignore = ["E203", "W503"]
-per-file-ignores = ["__init__.py:F401"]
+per-file-ignores = ["__init__.py:F401"]