Accept 'quit' to exit from telnet session

code/espurna/telnet.ino

@@ -45,7 +45,7 @@ void _telnetData(unsigned char clientId, void *data, size_t len) {
 
     // Capture close connection
     char * p = (char *) data;
-    if (strncmp(p, "close", 5) == 0) {
+    if ((strncmp(p, "close", 5) == 0) || (strncmp(p, "quit", 4) == 0)) {
         _telnetClients[clientId]->close();
         return;
     }