Add socket timeout

When reading data through a device called 'chargee sparky' I noticed that every time the wireless connection of the device is lost it stops transmitting data.
dsmr_parser based on the example in the README doesn't do anything and will simply sit there for hours waiting for the next telegram.
Adding a 1 minute timeout and breaking allows something upstream to notice, in my case my python runs as systemd service and once it exits it's restarted.

dsmr_parser/clients/socket_.py

@@ -31,12 +31,16 @@ class SocketReader(object):
         buffer = b""
 
         with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as socket_handle:
-
+            socket_handle.settimeout(60)
             socket_handle.connect((self.host, self.port))
 
             while True:
-                buffer += socket_handle.recv(self.BUFFER_SIZE)
-
+                try:
+                    buffer += socket_handle.recv(self.BUFFER_SIZE)
+                except socket.timeout::
+                    logger.error("Socket timeout occurred, exiting")
+                    break
+                    
                 lines = buffer.splitlines(keepends=True)
 
                 if len(lines) == 0: