Remove unnecessary shutdown function

ipc_unix/simple.py

@@ -38,11 +38,8 @@ class Server:
         thread.start()
         return thread
 
-    def shutdown(self):
-        self.server.shutdown()
-
     def close(self):
-        self.shutdown()
+        self.server.shutdown()
         self.server.server_close()
 
     def handle_request(self, request: dict):

tests/test_simple.py

@@ -14,7 +14,7 @@ class SimpleServerTestCase(TestCase):
         self.send_to_client = partial(send_to, self.socket_path)
 
     def tearDown(self):
-        self.server.shutdown()
+        self.server.close()
 
     def test_sending_dict(self):
         data = {"foo": "bar"}