fix: correct requirements and python version support. dev requirement…

… can be installed with: pip install ".[dev]"

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ 3.6, 3.7, 3.8, 3.9 ]
+        python-version: [ "3.6", "3.7", "3.8", "3.9", "3.10" ]
         os: [ ubuntu-latest, macOS-latest, windows-latest]
 
     steps:

setup.py

@@ -4,7 +4,6 @@
 with open("README.md", "r") as readme_file:
     readme = readme_file.read()
 
-requirements = ["casbin==0.8.4", "psycopg2-binary==2.8.6", "black==20.8b1"]
 
 setup(
     name="casbin-postgresql-watcher",
@@ -15,9 +14,18 @@
     long_description_content_type="text/markdown",
     url="https://github.com/pycasbin/postgresql-watcher",
     packages=find_packages(),
-    install_requires=requirements,
+    install_requires=open('requirements.txt').read().splitlines(),
+    extras_require={
+        'dev': [
+            open('dev_requirements.txt').read().splitlines(),
+        ]
+    },
     classifiers=[
+        "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",
         "License :: OSI Approved :: Apache Software License",
     ],
 )