Update setup.cfg

Author: bobfang1992

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = pytomlpp
-version = 1.0.2
+version = 1.0.3
 author = Bob Fang
 author_email = [email protected]
 license_file = LICENSE
@@ -11,13 +11,14 @@ project_urls =
     Source = https://github.com/bobfang1992/pytomlpp
     Tracker = https://github.com/bobfang1992/pytomlpp/issues
 classifiers =
-    Development Status :: 3 - Alpha
+    Development Status :: 5 - Production/Stable    
     Operating System :: OS Independent
     Programming Language :: Python
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Intended Audience :: Developers
     License :: OSI Approved :: MIT License
     Natural Language :: English