Update SimpleServer example to accept >1 connection

This moves the `accept()` call into the `while True` loop, leaving the server accepting connections as long as the `server` socket is valid.

Author: e28eta

examples/wiznet5k_simpleserver.py

@@ -28,8 +28,8 @@
 server.bind((server_ip, server_port))  # Bind to IP and Port
 server.listen()  # Begin listening for incoming clients
 
-conn, addr = server.accept()  # Wait for a connection from a client.
 while True:
+    conn, addr = server.accept()  # Wait for a connection from a client.
     with conn:
         data = conn.recv(1024)
         if data:  # Wait for receiving data