Bump to v0.3.1

Author: leeqvip

setup.py

@@ -7,7 +7,7 @@
 
 setuptools.setup(
     name="casbin_sqlalchemy_adapter",
-    version="0.3.0",
+    version="0.3.1",
     author="TechLee",
     author_email="[email protected]",
     description="SQLAlchemy Adapter for PyCasbin",