Update todo

TODO.md

@@ -4,10 +4,11 @@
 - Implement `AT+CIPSENDL` and `AT+CIPSENDLCFG` for long data send
 - Implement `AT+CIPTCPOPT` to configure TCP connection
 - Implement BLE feature
+- Implement BT feature
 - Transfer Cayenne MQTT app to be based on non-blocking API instead
 - Add DNS for IPv6 support (Optional)
 - Add support for WIFI GOT IP to parse IPv6
 - Add `AT+CWJEAP` for WPA2 connections
 - Implement single callback when station is connected and IP is received (so far STA_GOT_IP may be called several times in a row, when IP v4 and v6 are received)
    - Implement new type of event instead, that is called only once per connection
-- Check supported commands to determine `AT+CIPSTATUS` or `AT+CIPSTATE` command to obtain connection status
+- Add support for wifi mode `0` that has disabled WIFI IP