python3.9 compatibility

Author: qwj

pproxy/__doc__.py

@@ -1,5 +1,5 @@
 __title__       = "pproxy"
-__version__     = "2.4.5"
+__version__     = "2.4.6"
 __license__     = "MIT"
 __description__ = "Proxy server that can tunnel among remote servers by regex rules."
 __keywords__    = "proxy socks http shadowsocks shadowsocksr ssr redirect pf tunnel cipher ssl udp"

pproxy/server.py

@@ -635,7 +635,7 @@ def main():
             print('exit')
         if args.sys:
             args.sys.clear()
-    for task in asyncio.Task.all_tasks():
+    for task in asyncio.all_tasks(loop) if hasattr(asyncio, 'all_tasks') else asyncio.Task.all_tasks():
         task.cancel()
     for server in servers:
         server.close()