bump version to 0.4.0 for py upgrade

Author: cognifloyd

setup.py

@@ -48,12 +48,14 @@
         'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
         'Intended Audience :: Developers',
         'Environment :: Console',
     ],
+    python_requires='>=3.8',
     platforms=['Any'],
     scripts=[],
     provides=['st2auth_pam_backend'],

st2auth_pam_backend/__init__.py

@@ -21,4 +21,4 @@
     'PAMAuthenticationBackend'
 ]
 
-__version__ = '0.3.0'
+__version__ = '0.4.0'