Update classifiers and readme

Author: frenzymadness

README.md

@@ -142,6 +142,7 @@ Python 3.6 itself requires [`dataclasses`](https://pypi.org/project/dataclasses/
 * ? TYPE_UNKNOWN (no idea how to test unknown bytes-like objects as a bytes object)
 * ✓ TYPE_SET
 * ✓ TYPE_FROZENSET
+* ✓ TYPE_SLICE
 * ✓ FLAG_REF (recognized as a flag for all complex types)
 * ✓ TYPE_ASCII
 * ✓ TYPE_ASCII_INTERNED

setup.cfg

@@ -10,7 +10,7 @@ author_email = frenzy.madness@gmail.com
 license = MIT
 license_files = LICENSE
 classifiers =
-    Development Status :: 4 - Beta
+    Development Status :: 5 - Production/Stable
     Intended Audience :: Developers
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
@@ -20,6 +20,8 @@ classifiers =
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12
+    Programming Language :: Python :: 3.13
+    Programming Language :: Python :: 3.14
     Programming Language :: Python :: Implementation :: CPython
     License :: OSI Approved :: MIT License
     Operating System :: POSIX :: Linux