Bump to v0.3.0

Author: hsluoyz

setup.py

@@ -7,7 +7,7 @@
 
 setuptools.setup(
     name="casbin_sqlalchemy_adapter",
-    version="0.2.0",
+    version="0.3.0",
     author="TechLee",
     author_email="techlee@qq.com",
     description="SQLAlchemy Adapter for PyCasbin",
@@ -20,11 +20,11 @@
     python_requires=">=3.3",
     license="Apache 2.0",
     classifiers=[
-        "Programming Language :: Python :: 3.3",
-        "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "License :: OSI Approved :: Apache Software License",
         "Operating System :: OS Independent",
     ],