Merge pull request #509 from leancloud/py39

feat: support  python 3.9, drop python 3.5

Author: weakish

README.md

@@ -20,7 +20,7 @@ Maybe you need the `sudo` prefix depends on your OS environment.
 
 ## Supported Python Versions
 
-Python 2.7 and Python 3.5+.
+Python 2.7 and Python 3.6+.
 
 ## Generate API document
 

requirements.txt

@@ -1,9 +1,9 @@
-arrow
-iso8601
+arrow>=0.17.0,<1.0.0; python_version < '3.6'
+arrow>=1.0.0,<2.0.0; python_version >= '3.6'
+iso8601>=0.1.14
 six>=1.11.0
 qiniu>=7.1.4,<7.2.4
-requests>=2.20.0,<=2.22.0
-urllib3>=1.24.3,<=1.25.3
-Werkzeug>=0.16.0
+requests>=2.25.1
+Werkzeug>=0.16.0,<=2.0.0
 secure-cookie>=0.1.0,<1.0.0
-gevent>=1.0.2,<2.0.0
+gevent>=21.1.0,<22.0.0

setup.py

@@ -6,17 +6,20 @@
 here = path.abspath(path.dirname(__file__))
 
 install_requires = [
-    'arrow',
-    'iso8601',
+    'iso8601>=0.1.14',
     'six>=1.11.0',
     'qiniu>=7.1.4,<7.2.4',
-    'requests>=2.20.0,<=2.22.0',
-    'urllib3>=1.24.3,<=1.25.3',
-    'Werkzeug>=0.16.0',
+    'requests>=2.25.1',
+    'Werkzeug>=0.16.0,<=2.0.0',
     'secure-cookie>=0.1.0,<1.0.0',
-    'gevent>=1.0.2,<2.0.0'
+    'gevent>=21.1.0,<22.0.0'
 ]
 
+if sys.version_info < (3, 6, 0):
+    install_requires.append('arrow>=0.17.0,<1.0.0')
+else:
+    install_requires.append('arrow>=1.0.0,<2.0.0')
+
 if sys.version_info < (3, 5, 0):
     install_requires.append('typing')