Change development status classifier to Beta

Author: dgelessus

setup.cfg

@@ -4,7 +4,7 @@ version = attr: typedstream.__version__
 url = https://github.com/dgelessus/python-typedstream
 author = dgelessus
 classifiers =
-	Development Status :: 2 - Pre-Alpha
+	Development Status :: 4 - Beta
 	Intended Audience :: Developers
 	Topic :: Software Development :: Disassemblers
 	Topic :: System